I started riveting together the various parts onto the right rear spar tonight. The tricky part that the instructions tells you is to skip the rivets where the spars will later attach, as well as the row across the entire spar where the gap seals will later go. Almost all of the rivets could be installed with the hand squeezer, however some of the long rivets through the aileron hinge bracket needed to be driven with the rivet gun. Unfortunately, those rivets were still very hard to set because of the close proximity to the hinge bracket, which made me try to use the double-offset rivet set but that just ended up in frustration and many drilled out rivets. I ended up just installing those troublesome rivets with the factory head on the other side of the rear spar, with the shop head on the exposed side. This is just a cosmetic difference and not a functional one, and actually it's preferable to have the factory head on the thinner material (which is the rear spar) What's next? Time to ream the rear spar attachment bolt hole, and then begin riveting the rear spar assembly to the rest of the wing.