I have been thinking about this too. Hardwood fuse, motor mount, dowel (arrow shaft) spar with 1 screw, yardstick trailing edge, some kind of spacer for the fat part of the wing, and lead out guide support. Use the crease of fan fold foam as the leading edge and some simple fastenings on the skin. If a spar breaks, it is 1 screw. If the fuse breaks you have trouble though.
And that is as far as I got on my design idea, an incomplete list of metrics...
Phil