Added a list of Interiors. I'll help clear out land and set the warps between outside and inside.
Turnback Cave will have to be done post-release; it'll require over 150 different caves for a truly 'randomised' experience.
Distorion world follows similar, I'm just not sure how disappearing/reappearing trees and rocks will work, as well as the lift platforms.
Sinnoh Underground because that thing is huge, wont take too long, and may be used for another purpose.