This has the wing sitting on top of the cabin right. I did this on a similar plane and had the dowel in the wing (single) protruded down out the bottom at a 30 degree angel tying it into the center ribs with ply on each side from main spar with notches for the rear of the leading edge, hard balsa top and bottom, shaped as filler with carbon tow securing it to the dihedral brace and leading edgef. The rear of the dowel was inserted into a hole in the joiner. It's been rock solid for a year now