After putting it off for a week, I finally tackled the rear baffle on the tank. The actual sealing part wasn't bad but the riveting took forever...and once started, there was no stopping. Everything looks good, just need to install the coverplate in the inboard rib and pressure test the tank.
Tank float attach hole in 2nd bay
Solid rivets in the end rib/baffle/z bracket
Flop tube zip tied to keep it from banging inside the tank