After coming back from several days of travel, it was time to get back to work on the fuel tanks. The first step was to mount the left fuel tank skin into the cradles and test fit the first few ribs into place with clecos. Satisfied with the fitment, I removed the end rib and applied a fresh mix of tank sealant to its flange and started bucking rivets with the pneumatic rivet gun.
This ended up being pretty messy due to the tank sealant squeezing out everywhere--maybe I didn't need to apply as much as I did. In any case, I finished up by filleting the sealant on the internal edge. I also encapsulated the shop heads of rivets, though I'm not sure that was strictly necessary since these rivets are on the "outside" of the fuel containment.
This log entry puts me over the 300 hour threshold.
What's next? The empennage kit finally arrived today, so I'll be trying to verify its inventory before getting back to work on the fuel tanks.