I'm right now looking at doing a TIE Fighter Cockpit. Basically, like the Air Force F-15 coskpit display that people can walk up to and look inside of. Modular so that one wall can be removed to see inside at what it looks like.
Mind you, this isn't the whole fighter, just the cockpit ball. Maybe if I win the lottery, I'll build a TIE Advanced (Vader's TIE) around it or something... but for now, it will just be a cockpit.
Oh, and by modular, I mean that it can be stored in my spare room and be shipped with a U Haul truck.