I would agree with everything Kirk says on the wing issue. If you REALLY want to make it in two pieces, one way would be to strip some covering off the bottom of both wing halves right at the joint in two places, one near the front and one nearer the back. Then cut rectangular holes in the sheathing right next to the root ribs. Epoxy hardwood blocks to the root ribs on each side, leaving them flush with the sheeting. Then make a couple of metal plates with two holes. Screw the plates into the hardwood blocks on each side of the joint.

This is merely an idea. I've never actually done it, I was just thinking it might work.