Interiors would be fine. We have plenty of buildings in the four towns covered by the demo.

IB explains how to see the maps here:

Quote Originally Posted by ImmunityBow View Post
Okay, I've successfully gotten BTG's files to work on my RMXP! It takes a little fiddling around with first, so for those who want to see the maps on their own RMXP:
First, make sure the map numbers don't conflict with yours. Then place them in your Data folder in Pokestarter.
Then, run the Editor. It'll say something like "New maps in data folder imported successfully."
THEN, go into RMXP, check the map's properties, and then reselect the correct tileset. The maps should appear when you've said OK.