Hello,...
In my build I plan to have the joiner(s) slide into boxes so the wings can be separated at their center.
I may have two joiners; one at each spar. ...
Zor
Re the wing joiners: Although the rectangular aluminum bars that join the wing halves of my 100 inch H9 J3 provide great utility, a simpler approach is that used on the Alpha 60. The Alpha has an aluminum tube inserted into cardboard tubes in each wing half. The joiners pass through holes in the ribs that are lower in height on each rib going outboard to create the dihedral. However, this does not allow changing the dihedral once it is built in. The H9 approach could allow dihedral change by making the rectangular bars with the angles built in; the boxes in the wings would be parallel with the spars.
Years ago I bent the solid rod joiner on my Navistar to flatten the dihedral; but it is hard to bend tubing.
Good luck.