Not much progress over the last week, I was only able to get the left wing’s top skins match-drilled and the bottom skins clecoed in place. One thing to look out for here is match-drilling the tabs on each rib that fit under the spar flanges, since they can easily be misaligned even though the main part of the rib is clecoed to the skin. Look at the hole alignment before you drill, and adjust as necessary.