With Fred Coblentz' assistance, we were able to rivet the right side of the top skin to the instrument ribs and right longeron. We were smart this time and loosened the fuel vent line, removed the air vent and hose, and also some wiring bundles that interferred with moving the instrument box shelf around. After doing that, I was able to get good access to all of the rivets. Fred used his movable rivet set and was able to get a much cleaner riveting job along the longeron.
Everything was put back together after the skin was riveted in place.