I finished riveting to the top skin to the spar.
I ran into a pretty annoying issue. When I placed the flap on my tabletop, there was about 1.1 degrees of twist. This will need to be corrected. I’m going to sleep on the issue and come back tomorrow. Unfortunately, I’ll probably have to drill out all 50 rivets. I’m running into a lot of annoying issues with the flaps.