Thickening the outer front spars
I also had to add a piece of 1/8" thick spruce to the outer front spars as well. Buying these pieces nearly broke the budget. Do as I should have done not as I did...decide to use the new airfoil before you build the spars. Here, the outer spars are clamped together with the 1/8" spruce in the middle glued on with T-88.
Using about 30 feet of aquarium air tubing filled with water made certain that both outer forward spars had identical dihedral set. (camera did not focus well on close-ups)