Set wing spar angle at 9 degrees. Stacked two 1x1" for front spar. For rear had the same plus a 5/4"x3 placed 190mm from trailing edge. That combination worked to give me the 9 degree pitch with the wing upside down. Marked spars as directed. Dug bottom rear skin out of the big box. Was pleased to see that the hole for access to the aileron horn was pre-cut. Placed bottom rear skin inplace and fixed with duct tape on rear edge. Drilled and clecoed. Started with rear channel on #1 spar worked towards front. Then did #3, #5, #6, #7, #8 and went back to do #2 & 4.
