Today I moved the inboard end of the outboard skin so that it overlaps the inboard skin, then began riveting. I finished up the last four rivets through the inboard skin only, and then started up the rib at the overlap, before it just got too warm in the shop to continue (I was spending about a third of my time wiping up sweat off the skin). The sun had set, and the outboard end of the wing is under where the garage door raises and blocks the overhead light, so I couldn't open the door for ventilation.
I removed the aileron for easier access from the trailing edge of the wing, then called it a night. Hal Lyons is coming over tomorrow so we should be able to finish riveting this last skin then.