Are you having any specific issues? Design is subjective and personally I don’t think I’m good at it either (I always just go with rectangular blocks everywhere).
One thing that I don’t think I’d do is putting foundation through the whole map. That’s a whole lot of money upfront. I’d just build sections that I need and leave the rest undeveloped.
Might wanna set your shelves to not allow rotten then. No point getting your pawns hauling them in if they’re already rotten upon death