I installed about 30 more nutplates in the floor supports. All the ones in the "interior" of the floor are now done, and I got a good start on the ones along the edges. The edges are a lot harder to do, because of the lack of access, but I found that my pneumatic squeezer works pretty well there. I also had a chance to finally use that odd-shaped bucking bar I've had for so long now (Photo 1).
I also drilled out all the screw holes in the gear tower covers to #19 in preparation for installing nutplates.
It seems like I used half of my entire tool inventory installing the nutplates (Photo 2).