Long day today but a good one. I riveted the side skins on the aft fuselage up to the upper J channel per instructions. I've looked at several build logs online and saw that someone managed to rivet the two rows that attach the belly skin to the sides via ingenious use of a floor jack and back rivet setup, but that seems like it might have the potential for catastrophe, so if I can get a rivet partner over the next day or two I might just go that way. Will rethink tomorrow.