It would be swell if walls and slabs could be edited like solids in 3Dviz (or even ADT if i remember correctly), meaning any corner could be set to any xyz point .. it is quite a pain to import and export to 3dviz via gdl objects. works but sucks. and it isn't like you can side step with the mesh tool due to no overlapping xy but different z.
this whole thing (IMO) limits the design to fairly straightforward geometry, which is quite funny for such a complex program...
