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With all my respect, you must read Revit help first, then watch some videos from Autodesk University or whatever to understand how gbXML export works (or doesn't work) in Revit. 1. You always check your model in Revit in a "Detailed" tab with "Analytical surfaces" option enabled. This will explicitly show you what Revit is going to export and how. Pay attention to warnings and air gaps. 2. If I am not mistaking, assigning a position of a roof to its upper surface is a gbXML 0.37 feature. The same for floors. So yes, to get a closed volume you will see walls slightly extended. Moreover, the position of walls is their center line, so be aware how your room area and volumes are computed and how you align floors and roofs to walls - sometimes you will see shading surfaces or air gaps on their perimeter. 3. Your floor is not exported because it is too thick - check the "Sliver space tolerance" parameter. It is created for another purpose, but also affects on surfaces thicker than its value. So, in your case it must be more than 1100 mm. At the same time it means that in your model there must not be spaces of size less than this (e.g.risers) - they will not be exported. 4. Cannot say anything about your last error - actually from my experience it either means that a surface has wrong classification (e.g. interior instead of exterior) or there are pieces of walls which are interpreted as interior walls - these are not translated by OS, that's correct. This happens mostly when in your Revit model walls are not aligned and connected by their center lines.

With all my respect, you must read Revit help first, then watch some videos from Autodesk University or whatever to understand how gbXML export works (or doesn't work) in Revit. 1. You Revit.

1.You always check your model in Revit in a "Detailed" tab with "Analytical surfaces" option enabled. This will explicitly show you what Revit is going to export and how. Pay attention to warnings and air gaps. 2. If I am not mistaking, assigning a position of a roof to its upper surface is a gbXML 0.37 feature. The same for floors. So yes, to get a closed volume you will see walls slightly extended. Moreover, the position of walls is their center line, so be aware how your room area and volumes are computed and how you align floors and roofs to walls - sometimes you will see shading surfaces or air gaps on their perimeter. 3. Your floor is not exported because it is too thick - check the "Sliver space tolerance" parameter. It is created for another purpose, but also affects on surfaces thicker than its value. So, in your case it must be more than 1100 mm. At the same time it means that in your model there must not be spaces of size less than this (e.g.risers) - they will not be exported. 4. Cannot say anything about your last error - actually from my experience it either means that a surface has wrong classification (e.g. interior instead of exterior) or there are pieces of walls which are interpreted as interior walls - these are not translated by OS, that's correct. This happens mostly when in your Revit model walls are not aligned and connected by their center lines.

With all my respect, you must read Revit help first, then watch some videos from Autodesk University or whatever to understand how gbXML export works (or doesn't work) in Revit.