Shucks, my grandpa and uncles once built a boat in the loft of their garage/barn. There was no way to get it out down the steps or by the door through which they used to use to bring up bales of hay. When they did get it out -- eventually, by cutting the front wall of the second floor in half and rebuilding it as a door -- it worked really well. (They hinged it in case they ever built another boat up there.)

I understand about the airplanes.