Measured the slot clearance in the side skins required for the "fat" rivets on the wing spars. Do to their size and location, I will wait until I hang the wings to determine the amount of material to remove from the edge of the slot. The largest rivet was 1.135" long, the spar width is 0.835" and the slot width is 0.965". Pg. 23-06 Step 8: At the time I was working on Section 23 I overlooked the F-1256 Side Stiffeners, so now I Riveted the Side Stiffener to the Side Skins.
