Tonight it was time to close up the right fuel tank too. Applied a bead of tank sealant around the edge and then squished down the rear baffle against it. Then lots of clecoing and riveting. The rear baffle brackets were also blind riveted on while I still had this mixed tube of tank sealant in a usable state.
It was getting late so I decided to end the work session there, with the clecos still holding the skin through the holes that had been intentionally left without countersinking... Those can be be finished tomorrow.