Today was a day of interruptions, only worked for an hour or so. Riveted the flanges onto ribs 9 and 10 (image 1). A friend had the correct size rivets so I finished that riveting work, no pun intended. I need to install nutplates, that can wait.
I also riveted the flange at the root rib (images 2 and 3). One was not set properly so I drilled it out and set a new rivet. Making steady progress.