The last rib sealing/riveting tasks are installing the end ribs on each tank. Here’s the right tank with the outboard rib riveted; there’s obviously some cleaning-up to do.

The only detail worth mentioning on the outboard ribs is how to fit the T-410 nose reinforcement plate. With the rib clecoed in place, I laid out and drilled pilot holes in the reinforcement plate, then taped it in place against the inside of the rib with two-sided tape. That kept the plate in place while I removed the rib. It was easy, then, to match drill the plate and rib. The plate was sealed and riveted to the rib before the rib itself was riveted to the tank skin. Clear as mud, right?