I started by sliding the outboard under the inboard skin until the outboard edge of the wing aligned with the existing leading edge. I put duct tape on the outboard skin to hold it in place and drilled one rivet through the skin into the main spar and added a cleco. I then aligned the skin along the main spar and drilled more holes to hold the skin. I started in the middle and worked left and right, and down ribs when I came to them.

Drilling continued to complete the main spar and ribs. Each rib's location was obtained by extending the rib line from the leading edge. I marked a line over the outboard skin using a metal yardstick.

I marked the location of the W-625 and W-425(?) blind rib by reaching through the inspection hole with a Sharpie. I drilled the skin when I had it removed and then drilled the ribs after the skin was back on. I located the hidden rib at the inboard/outboard junction by measuring from the edge of the inboard skin to the desired rivet location with the outboard skin removed, then transferred that line to the top side of the inboard skin. The splice line was 1" outboard of that line. The splice line should be the last thing drilled.

The skin is now totally drilled, and most of the clecoes have been removed.

The nose rib skin is prepunched, as is the bottom of the outboard rib skin. That area is easily drilled.