I almost finished drilling the leading edge skin today. What I did was I drilled all the holes along the top of the spar flange placed the skin on and butted it up against the main skin and backed drilled it. Then I marked the inside of the skin with a marker where the ribs are, took the skin off and drilled my holes, put the skin back on and held it in place with the previous holes. With the skin held in place I put some straps over the skin and tighten the skin against the ribs. Then I drilled threw the skin in to the ribs when I was done doing that I got to do the same thing for the other side.
