In this session, I started by re-identifying which ribs went in which position using a process of elimination, since it was too hard to read my hand-written numbers on some of the ribs after priming them. Then I completed the hand-squeezing of universal-head rivets that were in 3 ribs, and installed all of the snap-in plastic snap bushings. I also finished countersinking all of the skin holes on the underside of the left wing spar, then protected all of the freshly exposed metal with my Touch-n-prep Alodine pen. Next step was to identify all of the correct length bolts that go through the wing spar and ribs, and slot them into the correct holes since each rib needs two different length bolts depending on its position. What's next? I need to torque down all of these spar bolts, and then begin riveting in these ribs to the spar. After that, I think it'll be time to start work on the trailing spar.