Oh man, if only I hadn't saw the 50+ feedbacks today about this!
Creating new levels for these is actually fairly simple. Single levels aren't the hardest thing to do, and it's not like the other houses have set a very high standard to match. I was actually contemplating adding some more house types, but I'm actually not sure if the system currently in place for picking houses will support more than what's already there(ie I don't know if it scrolls). This complicates things a bit. Other than that it might be a fun little side project for me to do. Maybe Rufus will let me do a cowboy-themed house with the old Nexus stuff.