I made my first significant error on the wings. In match drilling a couple of the ribs to the rear spar at the wing walk area, I match drilled from the rib side to the spar. This created a hole in W-707G that cut right through the edge of this part.
What I should have done is match drilled from the wing spar side into the ribs.
$25 in replacement parts on order…
PS – This isn’t my photo, but it shows exactly what I managed to do.