Today, I attached the shoulder harness anchors to the fuselage longerons. I then attached the gussets between the bulkheads and the longerons. Next, I cut the J channels, modified the ends per the plans, and put them in place. I also riveted the aftmost bulkhead to the fuselage. Next, I placed the aft fuselage skin in place, and cleco'd the assembly. I drilled all holes to final size and removed the skin. All holes were deburred and dimpled. Edges were edge finished. Finally, I riveted the aft skin to the fuselage with the exception of the lateral half of the right side (ran out of primer). I will pick up more primer and continue riveting during the next work session.