One of my other hobbies is flying RC planes. There has been an ongoing thread on one of those forums about a project a guy has been doing that is incredible. He built an RC plane in his DORM ROOM at college out of entirley pink foam. It has a 24' wingspan. That's feet, not inches. It's a long read, and this link is just the third of the three threads that it encompassed, but if you want to read and see something absolutely crazy, look at this:
Pink Floyd flies.