I remember reading a comment someone posted about how they built their town in an underground train station. I wasn't sure how they built things like a mine, or built a water tower or a garden. I'm sure there's other things I would have questioned. They DID say that the frame rates were much better, which is why I'm considering this. Does anyone have any thoughts on this? Will it work? If so, any good places I can do this that have a good amount of room?