I never followed your posts about the topography.
The next months I'll study your work because I really think it's possible to do some decent projects.
The first attempt to migrate from extruding to sweep is successful, https://github.com/caceres/SlopedPlanesMacro/tree/sweep
At the same time, I'll repair the overhang option. I'm seeing in your previous photos that it's a key question.
Later it will be time to code the 'Roof Recognition Macro' (the first version in an evening, nothing complicated).