[Elk]

We're at the point then...how big does an inside have to be? Think "realistic" aswell, if you try to do this :P

This here would do, IMO, and other houses can have more stages or go underground (take zodiacs OSL as example, it doesnt even have windows so it could aswell be underground, as it basicly IS (logically) since it's leading to a cave with other entrances), if more space is needed