How about an Air Camper with a 3-peice wing? Leave one outboard pannel
attached, them make 2 of the one you intend to remove. Cover and finish
one as normal. Make the other out of cheaper wood and leave it
uncovered. It would make a pretty good display, and would definately be
un-airworthy. Folks can see what the inside of a wood wing looks like,
and when you want to go flying, just swap out the pannels.

Where's the museum gonna be located?

Harry