Back Drilling the Wing Skins

I have back drilled the outboard wing leading edge skin. The original is .025 and is much longer than mine. I have a .032 leading edge skin that I got from Harmon. My RV-6 wing is the same length as the standard RV-6 wing. However, my gas tanks are longer-thus holding more gas. The leading edge skin is therefore shorter and I have upgraded it to .032. My tank skins are longer than the original and my ribs are closer together for added strength. I have back drilled the four outboard rib locations to my .032 skin. I will have to blind drill the edge rib that it close to the gas tank. The next thing I must do it start drilling the main wing skins onto the ribs before I can start drilling on the leading edge skins.