>>I will check out CADLearning, I had a quick look but it didnt seem to have much in the way of 3D software mainly Autocad and Desktop Arch.<< It won't be posted there for a little while yet, Peter, I'll post something here when it's available. >>Create editable splines that are extrude<< Yes, that's a very good method for creating roofs with ells. The method that I use most often is just to create each roof individually and push them into the intersecting roof. There's no real need usually to have roofs built as they are constructed and the intersections will render correctly. For example if I have a dormer on both sides of a gable roof I just make a very long dormer and let it run completely through. This is much easier to edit. Thanks again Ted