Over the last couple of nights I've continued to work on the trailing wing ribs. This mostly involved making sure the flanges were at 90 degree angles, fluting the flanges so the ribs lay flat, and dimpling all of the skin-contact holes. Unfortunately, I wasted some time and ended up having to re-dimple a few of the ribs because I noticed that my hand squeezer had been loosening the dies gradually after a large number of squeezes. I've also been using scotchbrite wheels in a drill and on the bench grinder to remove the sharp edges from both the lightening holes and the outer edges.

What's next? Maybe priming these ribs, or finishing countersinking the skin holes on the main spar...