- Sort out null volume walls (using revit parameter).
- Try Solid union errors - INCONS_FACE -- inconsistent face-body relationships and FACE_BOUNDARY -- wire being deleted crosses face boundary - #3 by Howie
remember to switch project units back! - Sometimes you can get faces(but not solids) with Element.OcSolid, OcSolid.OcFace and convert them to Dynamo surfaces with OcFace.ToDynamoType (Orchid package).