In order to finish riveting the innermost 3 ribs to the left main spar, I decided to un-cleco them and work on them from outboard to inboard. This would provide the most physical access for riveting since these ribs all faced with the flange side inboard, so this sequence also made the most sense.
Typically the recommendation is to keep the rivet factory head on the thinner metal (which would be the rib flange), so I kind of wanted to continue with that practice here. Unfortunately, the final rib already had the torque tube bracket riveted to it (as per the instructions), so this meant that I couldn't fit my rivet gun if I wanted to keep the factory head on the rib flanges. Since only a handful of rivets were holding that bracket onto the rib, I decided to just drill them out so that I could first attach the rib to the spar, then I would reattach the bracket.
Then I spent a few minutes reading the next section about the rear wing spar, and retrieving and organizing the parts for its aileron hinge brackets from the garage.
What's next? I need to buy a smaller torque wrench (since my current torque wrench is intended for larger sizes), and then do a final tightening of these bolts. Then I can start processing the aileron hinge brackets for the next section.