Located and laid out the Right wing aft skins. Used a piece of PVC to roll off the plastic covering. I had to deburr the holes on the bottom skin as they were very rough and would interfere with the ribs when I place the on the frame. The edges were pretty rough also and I used a fine file to cut the ridges before I used a scotchbrite wheel on them. Started fabricating the stiffners and their location. I had to look at the layout several times to make sure I had it right.