Today I did some more work on the dog platform (no pictures, sorry). I've got some scrap aluminum from the center section bottom skin which I'm going to use to reinforce the edges. I need to use Chapter 9's shear tomorrow to get some nice straight edges.
After that I decided to assemble the seat backs. These had been drilled and primed for some time, so it didn't take long to rivet them together. The top two rows of rivets were done with the rivet gun and the c-frame. All the rest were done with the squeezer.