I have been wondering from the second I saw the hammering idiots in Sanctuary, what are those idiots in Sanctuary really fixing all the time. at first I thought wow great, may be I can assign them for fixing things around, may be the fixes are progressing somehow, like may be after a period of time like a week or so, those walls will be restored to their original states or at least to a more restorated/fixed version. But no, it is just a silly animation with no intelligent script behind. So I would add such functions to such a project, Instead of replacing everything at once with restorated/new versions, I would have some settlers assigned to objects/buildings and let the fixing animation activated and after a period of time that object would be replaced with better/cleaner versions (need for crafting materials for any fix as well, etc...). (I tried myself it is nearly impossible for me to do what i really want, not a hardcore modder anyway) Good Luck