The photos below show progress that is an accumulation of off and on work for quite a few days.
Primed all the ribs, then riveted them to the main and rear spars. Looks like the rivets on the trailing spar are backwards from what the plans recommend (manufactured head on the thinnest side to avoid rib distortion); however I squeezed rather than use a gun, and there is no sign of distortion.
Still just a few holes left to rivet.
Today my good friend Michael Beare stopped over to help drive rivets into the main spar. I started this part of the riveting solo last weekend; however the result was that at least half a dozen rivets needed to be drilled out. Completely different outcome with his help -- and he is experienced to boot!
Total Time: 10 hours