Thanks, John. I made a trip to the hardware store and picked up 10 small rectangles of MDF (for about $5) to square up the sides of the fuselage. Then, as you said, I made up pairs of cross-beams. This is all still a bit of an experiment just to see what's possible. The fuse is made entirely of 3mm bamboo. But I'm going to be adding ply gussets and, of course, also functional rigging. I found some stuff at the fishing shop that I think is kevlar.