Today, I got the inner wing skin countersunk where called out in the plans. These are places where the outer skin is backed up by an inner skin. This area needs the extra strength of two layers of skin and dense ribs as this is where we will be walking on the wing when we board.
I also removed strips of the blue protective plastic from the rivet lines. This step isn’t really necessary, as the first thing you do before painting is scuff the entire plane, but it makes me feel good!