I may have neglected to say much about it but the lower wing will mount on a wing tube. the yellow cardboard tubes are there to help with passing the aluminum tube from side to side. There will of course also be an anti-rotation pin. If you notice the bits of 1/4 square basswood at the junction of the spar carry through and the wing root that is where the attachment points for some of the wing rigging will be located. Although the airplane should be strong enough to fly without the flying wires i am putting in mounting point for functional flying wires.
