diff --git a/model.ifc b/model.ifc
index 9391799..b2a2188 100644
--- a/model.ifc
+++ b/model.ifc
@@ -1,7 +1,7 @@
 ISO-10303-21;
 HEADER;
 FILE_DESCRIPTION(('ViewDefinition[DesignTransferView]'),'2;1');
-FILE_NAME('model.ifc','2025-01-22T14:23:05+00:00',('',''),('',''),'IfcOpenShell 0.8.1-alpha250121','Bonsai 0.8.1-alpha250121-c72f170','Nobody');
+FILE_NAME('model.ifc','2025-01-29T22:55:09+00:00',('',''),('',''),'IfcOpenShell 0.0.0','Bonsai 0.0.0','Nobody');
 FILE_SCHEMA(('IFC4'));
 ENDSEC;
 DATA;
@@ -63,7 +63,7 @@ DATA;
 #820=IFCRELASSOCIATESMATERIAL('2UzZHJwaXChfAfKhYuqKSl',$,$,$,(#817),#819);
 #821=IFCMATERIALLAYER(#66,0.224999994039536,$,$,$,$,$);
 #825=IFCWALL('3nNHSYg1TEPhGR3j0h9fp7',$,'Wall',$,$,#5184,#833,$,$);
-#826=IFCRELCONTAINEDINSPATIALSTRUCTURE('1AIiugDf11qOSAqgsCSoIS',$,$,$,(#5744,#22359,#5480,#9061,#11310,#17167,#11202,#4749,#35814,#8594,#20272,#8783,#7828,#6096,#14567,#35158,#14404,#11838,#13011,#19574,#28059,#5913,#8682,#35763,#33931,#4603,#34966,#14756,#14681,#31703,#6366,#4886,#13523,#5875,#3036,#11135,#10125,#11377,#35560,#4847,#5844,#35780,#28135,#14190,#883,#31665,#12473,#10556,#10983,#22309,#6178,#35797,#33967,#7413,#15127,#3506,#8621,#28163,#825,#6312,#17134,#22249),#42);
+#826=IFCRELCONTAINEDINSPATIALSTRUCTURE('1AIiugDf11qOSAqgsCSoIS',$,$,$,(#4603,#22249,#14756,#14681,#6366,#35797,#31703,#13523,#5875,#3036,#10125,#5844,#4847,#11135,#11377,#28135,#14190,#35814,#883,#12473,#31665,#10983,#35763,#35158,#10556,#22309,#6178,#3506,#33967,#7413,#15127,#28163,#8621,#33931,#34966,#4886,#825,#6312,#17134,#17167,#5480,#9061,#5744,#22359,#11310,#4749,#11202,#35560,#35780,#7828,#8594,#6096,#20272,#8783,#14567,#14404,#11838,#13011,#19574,#5913,#28059,#8682),#42);
 #827=IFCRELDEFINESBYTYPE('1Oe2067GD6EwhZqTpB4iC5',$,$,$,(#17134,#17167,#18747,#17333,#17366,#17399,#21660,#20500,#20272,#19284,#883,#6096,#31665,#19574,#17479,#12473,#6178,#31703,#14874,#14831,#22422,#21711,#4603,#14941,#3506,#19991,#20540,#20024,#17439,#825,#33659,#33991,#34048,#34165,#34209,#34240,#34333,#34377,#34421),#817);
 #828=IFCMATERIALLAYERSETUSAGE(#819,.AXIS2.,.POSITIVE.,0.,$);
 #829=IFCRELASSOCIATESMATERIAL('1_tqYCcgH4_evqOxw6qBfY',$,$,$,(#825),#828);
@@ -780,7 +780,7 @@ DATA;
 #6334=IFCLOCALPLACEMENT(#65,#6333);
 #6338=IFCSTAIRFLIGHTTYPE('2TSSfkhnv0HfFsK7LcqAar',$,'steps',$,$,(#6364),$,$,$,.STRAIGHT.);
 #6364=IFCPROPERTYSET('3boNv3CWz8Su6iJ2Lt6kTl',$,'BBIM_Stair',$,(#6365));
-#6365=IFCPROPERTYSINGLEVALUE('Data',$,IFCTEXT('{"stair_type": "CONCRETE", "width": 1.7999999523162842, "height": 1.440000057220459, "number_of_treads": 8, "tread_run": 0.3050000071525574, "nosing_length": 0.0, "nosing_depth": 0.0, "base_slab_depth": 0.0, "top_slab_depth": 0.25, "has_top_nib": false, "tread_depth": 0.25, "custom_first_last_tread_run": [0.0, 0.0]}'),$);
+#6365=IFCPROPERTYSINGLEVALUE('Data',$,IFCTEXT('{"stair_type": "CONCRETE", "width": 1.7999999523162842, "height": 1.2799999713897705, "number_of_treads": 7, "tread_run": 0.3050000071525574, "nosing_length": 0.0, "nosing_depth": 0.0, "base_slab_depth": 0.0, "top_slab_depth": 0.25, "has_top_nib": false, "tread_depth": 0.25, "custom_first_last_tread_run": [0.0, 0.0]}'),$);
 #6366=IFCSTAIRFLIGHT('2hzBleGqP3Uh0u_7FJc2Yf',$,'StairFlight',$,$,#6399,#6384,$,6,5,0.166666666666667,0.25,.STRAIGHT.);
 #6384=IFCPRODUCTDEFINITIONSHAPE($,$,(#31660,#31663));
 #6385=IFCRELDEFINESBYTYPE('2Qp1Ypb2v1_QAW6cDfiySi',$,$,$,(#6366,#8621,#8682,#8783,#8906,#22249,#22309,#34966),#6338);
@@ -9017,61 +9017,25 @@ DATA;
 #34963=IFCINDEXEDPOLYGONALFACE((7,5,3,8));
 #34964=IFCINDEXEDPOLYGONALFACE((3,5,1,2));
 #34965=IFCPOLYGONALFACESET(#34958,$,(#34959,#34960,#34961,#34962,#34963,#34964),$);
-#34966=IFCSTAIRFLIGHT('0mKZ1Wz619GOTj$HR8wW4T',$,'StairFlight',$,$,#35047,#34979,$,9,8,0.160000006357829,0.25,.STRAIGHT.);
+#34966=IFCSTAIRFLIGHT('0mKZ1Wz619GOTj$HR8wW4T',$,'StairFlight',$,$,#35984,#34979,$,8,7,0.159999996423721,0.25,.STRAIGHT.);
 #34972=IFCRELDEFINESBYPROPERTIES('3WG7G0TA171uotIm7uQTBm',$,$,$,(#34966),#34973);
 #34973=IFCPROPERTYSET('0xhOeeoMb6ywLFfjC8L2Fb',$,'Pset_StairFlightCommon',$,(#34974,#34975,#34976,#34977,#34978));
-#34974=IFCPROPERTYSINGLEVALUE('NumberOfRiser',$,IFCCOUNTMEASURE(9.),$);
-#34975=IFCPROPERTYSINGLEVALUE('NumberOfTreads',$,IFCCOUNTMEASURE(8.),$);
-#34976=IFCPROPERTYSINGLEVALUE('RiserHeight',$,IFCPOSITIVELENGTHMEASURE(0.160000006357829),$);
+#34974=IFCPROPERTYSINGLEVALUE('NumberOfRiser',$,IFCCOUNTMEASURE(8.),$);
+#34975=IFCPROPERTYSINGLEVALUE('NumberOfTreads',$,IFCCOUNTMEASURE(7.),$);
+#34976=IFCPROPERTYSINGLEVALUE('RiserHeight',$,IFCPOSITIVELENGTHMEASURE(0.159999996423721),$);
 #34977=IFCPROPERTYSINGLEVALUE('TreadLength',$,IFCPOSITIVELENGTHMEASURE(0.25),$);
 #34978=IFCPROPERTYSINGLEVALUE('NosingLength',$,IFCLENGTHMEASURE(0.),$);
-#34979=IFCPRODUCTDEFINITIONSHAPE($,$,(#35039,#35042));
-#35012=IFCINDEXEDPOLYGONALFACE((2,1,22,21,20,19,18,17,16,15,14,13,12,11,10,9,8,7,6,5,4,3));
-#35013=IFCINDEXEDPOLYGONALFACE((23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44));
-#35014=IFCINDEXEDPOLYGONALFACE((14,15,36,35));
-#35015=IFCINDEXEDPOLYGONALFACE((7,8,29,28));
-#35016=IFCINDEXEDPOLYGONALFACE((20,21,42,41));
-#35017=IFCINDEXEDPOLYGONALFACE((15,16,37,36));
-#35018=IFCINDEXEDPOLYGONALFACE((8,9,30,29));
-#35019=IFCINDEXEDPOLYGONALFACE((1,2,23,44));
-#35020=IFCINDEXEDPOLYGONALFACE((16,17,38,37));
-#35021=IFCINDEXEDPOLYGONALFACE((9,10,31,30));
-#35022=IFCINDEXEDPOLYGONALFACE((2,3,24,23));
-#35023=IFCINDEXEDPOLYGONALFACE((17,18,39,38));
-#35024=IFCINDEXEDPOLYGONALFACE((10,11,32,31));
-#35025=IFCINDEXEDPOLYGONALFACE((3,4,25,24));
-#35026=IFCINDEXEDPOLYGONALFACE((18,19,40,39));
-#35027=IFCINDEXEDPOLYGONALFACE((11,12,33,32));
-#35028=IFCINDEXEDPOLYGONALFACE((4,5,26,25));
-#35029=IFCINDEXEDPOLYGONALFACE((19,20,41,40));
-#35030=IFCINDEXEDPOLYGONALFACE((12,13,34,33));
-#35031=IFCINDEXEDPOLYGONALFACE((5,6,27,26));
-#35032=IFCINDEXEDPOLYGONALFACE((22,44,43));
-#35033=IFCINDEXEDPOLYGONALFACE((13,14,35,34));
-#35034=IFCINDEXEDPOLYGONALFACE((6,7,28,27));
-#35035=IFCINDEXEDPOLYGONALFACE((21,22,43,42));
-#35036=IFCINDEXEDPOLYGONALFACE((22,1,44));
-#35037=IFCCARTESIANPOINTLIST3D(((0.,0.,0.),(0.,0.,0.160000011324883),(0.305000007152557,0.,0.160000011324883),(0.305000007152557,0.,0.320000022649765),(0.610000014305115,0.,0.320000022649765),(0.610000014305115,0.,0.480000019073486),(0.915000021457672,0.,0.480000019073486),(0.915000021457672,0.,0.64000004529953),(1.22000002861023,0.,0.64000004529953),(1.22000002861023,0.,0.800000071525574),(1.52500009536743,0.,0.800000071525574),(1.52500009536743,0.,0.960000097751617),(1.83000016212463,0.,0.960000097751617),(1.83000016212463,0.,1.12000012397766),(2.13500022888184,0.,1.12000012397766),(2.13500022888184,0.,1.28000009059906),(2.44000029563904,0.,1.28000009059906),(2.44000029563904,0.,1.44000005722046),(2.74500036239624,0.,1.44000005722046),(2.74500036239624,0.,1.15768885612488),(0.538155972957611,0.,0.),(0.,0.,0.),(0.,1.79999995231628,0.160000011324883),(0.305000007152557,1.79999995231628,0.160000011324883),(0.305000007152557,1.79999995231628,0.320000022649765),(0.610000014305115,1.79999995231628,0.320000022649765),(0.610000014305115,1.79999995231628,0.480000019073486),(0.915000021457672,1.79999995231628,0.480000019073486),(0.915000021457672,1.79999995231628,0.64000004529953),(1.22000002861023,1.79999995231628,0.64000004529953),(1.22000002861023,1.79999995231628,0.800000071525574),(1.52500009536743,1.79999995231628,0.800000071525574),(1.52500009536743,1.79999995231628,0.960000097751617),(1.83000016212463,1.79999995231628,0.960000097751617),(1.83000016212463,1.79999995231628,1.12000012397766),(2.13500022888184,1.79999995231628,1.12000012397766),(2.13500022888184,1.79999995231628,1.28000009059906),(2.44000029563904,1.79999995231628,1.28000009059906),(2.44000029563904,1.79999995231628,1.44000005722046),(2.74500036239624,1.79999995231628,1.44000005722046),(2.74500036239624,1.79999995231628,1.15768885612488),(0.538155972957611,1.79999995231628,0.),(0.,1.79999995231628,0.),(0.,1.79999995231628,0.)));
-#35038=IFCPOLYGONALFACESET(#35037,.T.,(#35012,#35013,#35014,#35015,#35016,#35017,#35018,#35019,#35020,#35021,#35022,#35023,#35024,#35025,#35026,#35027,#35028,#35029,#35030,#35031,#35032,#35033,#35034,#35035,#35036),$);
-#35039=IFCSHAPEREPRESENTATION(#15,'Body','Tessellation',(#35038));
-#35040=IFCCARTESIANPOINT((0.,0.,0.));
-#35041=IFCBOUNDINGBOX(#35040,2.74500036239624,1.79999995231628,1.44000005722046);
-#35042=IFCSHAPEREPRESENTATION(#17,'Box','BoundingBox',(#35041));
-#35043=IFCCARTESIANPOINT((18.2582015991211,9.34378051757812,2.79999971389771));
-#35044=IFCDIRECTION((0.,0.,1.));
-#35045=IFCDIRECTION((0.999999999999954,-3.0199157663445E-07,0.));
-#35046=IFCAXIS2PLACEMENT3D(#35043,#35044,#35045);
-#35047=IFCLOCALPLACEMENT(#65,#35046);
-#35048=IFCRAILINGTYPE('0gPloG7rT78gKJw70k3K6v',$,'Unnamed',$,$,(#35049,#35051),(#35080,#35719),$,$,.USERDEFINED.);
+#34979=IFCPRODUCTDEFINITIONSHAPE($,$,(#35876,#35879));
+#35048=IFCRAILINGTYPE('0gPloG7rT78gKJw70k3K6v',$,'Unnamed',$,$,(#35049,#35051),(#35080,#35965),$,$,.USERDEFINED.);
 #35049=IFCPROPERTYSET('1YcvNtF$nAouda8s325_ig',$,'BBIM_Railing',$,(#35050));
-#35050=IFCPROPERTYSINGLEVALUE('Data',$,IFCTEXT('{"railing_type": "FRAMELESS_PANEL", "height": 1.0, "thickness": 0.05000000074505806, "spacing": 0.05000000074505806, "path_data": {"edges": [[0, 1], [1, 2], [2, 3]], "verts": [[-0.5320777893066406, -0.4589195251464844, -0.35000133514404297], [0.6878690719604492, -0.45883893966674805, 0.2899320125579834], [1.907815933227539, -0.4587583541870117, 0.9298653602600098], [2.213756561279297, -0.4594297409057617, 0.9299988746643066]]}}'),$);
+#35050=IFCPROPERTYSINGLEVALUE('Data',$,IFCTEXT('{"railing_type": "FRAMELESS_PANEL", "height": 1.0, "thickness": 0.05000000074505806, "spacing": 0.05000000074505806, "path_data": {"edges": [[0, 1], [1, 2], [2, 3], [3, 4]], "verts": [[-0.22718429565429688, -0.45923709869384766, -0.35000109672546387], [0.38281679153442383, -0.45923781394958496, -0.030001044273376465], [0.9928178787231445, -0.45923852920532227, 0.28999876976013184], [1.6028156280517578, -0.45923805236816406, 0.6099987030029297], [2.212810516357422, -0.45926952362060547, 0.9299988746643066]]}}'),$);
 #35051=IFCPROPERTYSET('3_PGlaFirDKBFkJk6Je9Rg',$,'Pset_RailingCommon',$,(#35052));
 #35052=IFCPROPERTYSINGLEVALUE('Height',$,IFCPOSITIVELENGTHMEASURE(1.),$);
 #35076=IFCCARTESIANPOINT((0.,0.,0.));
 #35077=IFCDIRECTION((1.,0.,0.));
 #35078=IFCDIRECTION((0.,0.,1.));
 #35079=IFCAXIS2PLACEMENT3D(#35076,#35078,#35077);
-#35080=IFCREPRESENTATIONMAP(#35079,#35710);
+#35080=IFCREPRESENTATIONMAP(#35079,#35956);
 #35126=IFCRELDEFINESBYTYPE('2aNWJOBDr9ZxSHCCim31k9',$,$,$,(#35560,#35158),#35048);
 #35158=IFCRAILING('3Ac_ylXGj03e0JrL_ZLQHN',$,'Railing',$,'FRAMELESS_PANEL',#35559,#35166,$,.USERDEFINED.);
 #35159=IFCCARTESIANPOINT((0.,0.,0.));
@@ -9081,7 +9045,7 @@ DATA;
 #35163=IFCCARTESIANTRANSFORMATIONOPERATOR3D(#35160,#35161,#35159,1.,#35162);
 #35164=IFCMAPPEDITEM(#35080,#35163);
 #35165=IFCSHAPEREPRESENTATION(#15,'Body','MappedRepresentation',(#35164));
-#35166=IFCPRODUCTDEFINITIONSHAPE($,$,(#35165,#35726));
+#35166=IFCPRODUCTDEFINITIONSHAPE($,$,(#35165,#35979));
 #35555=IFCCARTESIANPOINT((18.7903861999512,9.80301761627197,3.31000089645386));
 #35556=IFCDIRECTION((0.,0.,1.));
 #35557=IFCDIRECTION((1.,0.,0.));
@@ -9095,53 +9059,7 @@ DATA;
 #35570=IFCCARTESIANTRANSFORMATIONOPERATOR3D(#35567,#35568,#35566,1.,#35569);
 #35571=IFCMAPPEDITEM(#35080,#35570);
 #35572=IFCSHAPEREPRESENTATION(#15,'Body','MappedRepresentation',(#35571));
-#35573=IFCPRODUCTDEFINITIONSHAPE($,$,(#35572,#35733));
-#35687=IFCINDEXEDPOLYGONALFACE((23,26,25,24));
-#35688=IFCINDEXEDPOLYGONALFACE((27,30,29,28));
-#35689=IFCINDEXEDPOLYGONALFACE((6,5,12));
-#35690=IFCINDEXEDPOLYGONALFACE((8,18,17,7,15,16));
-#35691=IFCINDEXEDPOLYGONALFACE((10,22,21,9,19,20));
-#35692=IFCINDEXEDPOLYGONALFACE((31,34,33,32));
-#35693=IFCINDEXEDPOLYGONALFACE((22,31,32,21));
-#35694=IFCINDEXEDPOLYGONALFACE((15,29,30,16));
-#35695=IFCINDEXEDPOLYGONALFACE((9,21,32,33,19));
-#35696=IFCINDEXEDPOLYGONALFACE((20,34,31,22,10));
-#35697=IFCINDEXEDPOLYGONALFACE((19,33,34,20));
-#35698=IFCINDEXEDPOLYGONALFACE((8,16,30,27,18));
-#35699=IFCINDEXEDPOLYGONALFACE((11,25,26,12));
-#35700=IFCINDEXEDPOLYGONALFACE((18,27,28,17));
-#35701=IFCINDEXEDPOLYGONALFACE((17,28,29,15,7));
-#35702=IFCINDEXEDPOLYGONALFACE((6,12,26,23,14));
-#35703=IFCINDEXEDPOLYGONALFACE((14,23,24,13));
-#35704=IFCINDEXEDPOLYGONALFACE((13,24,25,11,5));
-#35705=IFCINDEXEDPOLYGONALFACE((6,14,13));
-#35706=IFCINDEXEDPOLYGONALFACE((5,11,12));
-#35707=IFCINDEXEDPOLYGONALFACE((6,13,5));
-#35708=IFCCARTESIANPOINTLIST3D(((-0.532077789306641,-0.458919525146484,-0.350001335144043),(0.687869071960449,-0.458838939666748,0.289932012557983),(1.90781593322754,-0.458758354187012,0.92986536026001),(2.2137565612793,-0.459429740905762,0.929998874664307),(-0.507077813148499,-0.458917886018753,-0.336887389421463),(0.662869095802307,-0.458840578794479,0.276818066835403),(0.712869048118591,-0.458837300539017,0.303045958280563),(1.8828159570694,-0.458759993314743,0.916751384735107),(1.93281590938568,-0.458813220262527,0.929876267910004),(2.18875670433044,-0.459374874830246,0.929987967014313),(-0.507079482078552,-0.433917880058289,-0.336887389421463),(0.662867426872253,-0.433840572834015,0.276818066835403),(-0.507076144218445,-0.483917891979218,-0.336887389421463),(0.662870764732361,-0.483840584754944,0.276818066835403),(0.712867379188538,-0.433837294578552,0.303045958280563),(1.88281428813934,-0.433759987354279,0.916751384735107),(0.712870717048645,-0.483837306499481,0.303045958280563),(1.88281762599945,-0.483759999275208,0.916751384735107),(1.93287074565887,-0.433813273906708,0.929876267910004),(2.18881154060364,-0.434374928474426,0.929987967014313),(1.93276107311249,-0.483813166618347,0.929876267910004),(2.18870186805725,-0.484374821186066,0.929987967014313),(0.662870764732361,-0.483840584754944,1.27681803703308),(-0.507076144218445,-0.483917891979218,0.663112640380859),(-0.507079482078552,-0.433917880058289,0.663112640380859),(0.662867426872253,-0.433840572834015,1.27681803703308),(1.88281762599945,-0.483759999275208,1.91675138473511),(0.712870717048645,-0.483837306499481,1.30304598808289),(0.712867379188538,-0.433837294578552,1.30304598808289),(1.88281428813934,-0.433759987354279,1.91675138473511),(2.18870186805725,-0.484374821186066,1.92998790740967),(1.93276107311249,-0.483813166618347,1.92987632751465),(1.93287074565887,-0.433813273906708,1.92987632751465),(2.18881154060364,-0.434374928474426,1.92998790740967)));
-#35709=IFCPOLYGONALFACESET(#35708,.F.,(#35687,#35688,#35689,#35690,#35691,#35692,#35693,#35694,#35695,#35696,#35697,#35698,#35699,#35700,#35701,#35702,#35703,#35704,#35705,#35706,#35707),$);
-#35710=IFCSHAPEREPRESENTATION(#15,'Body','Tessellation',(#35709));
-#35712=IFCCARTESIANPOINT((-0.532077789306641,-0.484374821186066,-0.350001335144043));
-#35713=IFCBOUNDINGBOX(#35712,2.74583435058594,0.0506148338317871,2.27998924255371);
-#35714=IFCSHAPEREPRESENTATION(#17,'Box','BoundingBox',(#35713));
-#35715=IFCCARTESIANPOINT((0.,0.,0.));
-#35716=IFCDIRECTION((1.,0.,0.));
-#35717=IFCDIRECTION((0.,0.,1.));
-#35718=IFCAXIS2PLACEMENT3D(#35715,#35717,#35716);
-#35719=IFCREPRESENTATIONMAP(#35718,#35714);
-#35720=IFCCARTESIANPOINT((0.,0.,0.));
-#35721=IFCDIRECTION((1.,0.,0.));
-#35722=IFCDIRECTION((0.,1.,0.));
-#35723=IFCDIRECTION((0.,0.,1.));
-#35724=IFCCARTESIANTRANSFORMATIONOPERATOR3D(#35721,#35722,#35720,1.,#35723);
-#35725=IFCMAPPEDITEM(#35719,#35724);
-#35726=IFCSHAPEREPRESENTATION(#17,'Box','MappedRepresentation',(#35725));
-#35727=IFCCARTESIANPOINT((0.,0.,0.));
-#35728=IFCDIRECTION((1.,0.,0.));
-#35729=IFCDIRECTION((0.,1.,0.));
-#35730=IFCDIRECTION((0.,0.,1.));
-#35731=IFCCARTESIANTRANSFORMATIONOPERATOR3D(#35728,#35729,#35727,1.,#35730);
-#35732=IFCMAPPEDITEM(#35719,#35731);
-#35733=IFCSHAPEREPRESENTATION(#17,'Box','MappedRepresentation',(#35732));
+#35573=IFCPRODUCTDEFINITIONSHAPE($,$,(#35572,#35972));
 #35734=IFCCARTESIANPOINT((18.7903861999512,11.6030178070068,3.31000089645386));
 #35735=IFCDIRECTION((0.,0.,1.));
 #35736=IFCDIRECTION((1.,0.,0.));
@@ -9243,5 +9161,88 @@ DATA;
 #35848=IFCDIRECTION((1.,0.,0.));
 #35849=IFCAXIS2PLACEMENT3D(#35846,#35847,#35848);
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 ENDSEC;
 END-ISO-10303-21;