I tried this challenge about a year ago in Sunset Valley, and while it was fun in the beginning, it didn't work out well in the end. I'm not sure if I put the buildings back in at the wrong timing/order or not, but there ended up being a tremendous amount of lag, I think because the game wanted to spawn NPCs or something. The no-taxi mod was really helpful for this, I had them running everywhere and foraging in the forest. I think I might try it again though--it also could have been some glitch with a cheat code too.
