Originally posted by Foxglovez:

Start from the ground up. Your ground is too low if first item isn't blue. If I am understanding you correctly... Some times you just can't reverse engineer stuff. You can also fill in by raising the ground, not just flattening it. May or may not cause a bit of a hump which you can then correct later.

https://steamcommunity.com/sharedfiles/filedetails/?id=2977142832
I'm starting with existing structures so ground placement is stymied a bit. Sometimes I can just raise the ground but often that's not an option.

I keep seeing these abandoned structures with a beam set well into the ground.