Question:
Is there any reason I couldn't double the thickness of the kit's 1/4" x 1" dihedral ply brace to 7/16" thick and use that as a removable wing joiner?
It could slipped into place and boxed in between the 3/8" thick upper and lower pine spars. Then the spars would be reinforced with shear webbing on both sides to prevent the brace from pushing out the top of the spar. The 7/16" thick ply brace will weigh 110 grams and less then then aluminum tube and sleeve too.