1. Completed most of the riveting of the top skin -- everything except for the firewall flange. I unapologetically ended up using quite a lot of Cherry Max rivets... basically anyplace where I couldn't easily get access to the backside of the skin with a small bucking bar. 2. Used a rivet shaving bit to smooth out a couple of rivet stems that weren't totally flush. 3. Riveted the skin / rollbar connector rib into place. 4. Removed the Skybolt plates and countersunk the fastener rivet holes. 5. Positioned and drilled the Skybolt plates under the firewall skin flange, one at a time, using the skin holes as a drill guide. I used a 0.24" flange reveal distance for the plates, in accordance with the manufacturer's suggestion. 6. Removed all the Skybolt plates and deburred them, then re-clecoed them into position. (BTW, I left off the bottom three plates on each side, just so I can tweak their spacing slightly after I trim the top and bottom cowlings. I want to make sure the bottom Skybolt fastener on the firewall is directly in line with the horizontal row on the cowling split line.)