Riveted both aft side panels. Riveted skin to lower longerons, and skins to vertical channels. Only had to drill out one rivet in the left lower longeron. Upper longeron and #1 vertical channel are not riveted until later assemblies.
Then I spent some quality time re-organizing the remaining skins which are stored on the lower shelf of my workbench. Pulled them all out, discarded no-longer-needed butcher paper layers, and re-ordered the skins bottom-to-top and improved their access from the most easy-to-reach end of the bench.
Then I dug around in the machined angle parts box and the channel bundles to get the stock I'll need for the cross-ties and other aft fuse subassemblies like the shear web, seat belt attachments, etc.
