Next Project?

So the Mendel printer's almost done. What's on my list of potential projects?

• Build a model of a railroad handcar, using the Makerbot to print all the cast and fabricated metal parts, but using wood for the parts that would be wood on the real thing.
  
• Print some large railroad wheels, either for the handcar or for some other project. How large can I go?
  
• An HO model of a 1950's style burger stand (like this Dairy Queen
  
• More ergonomic throttle case for the model railroad throttles I use.
  
• Print a full railroad car in HO. (Requires the Mendel so I can print a 6" long piece.)