1 hr, 23 rivets

And those last four weren't easy.
The first 19 were riveting the trim servo reinforcement plate to the lower skin. Used a squeezer for most and back riveted the innermost 3. Back riveting would have been much faster for all of them.

The last 4 were from riveting the counterbalance assembly to the spar. For the left, chose to follow the instructions and do this after riveting the spar to the upper skin. I think it was much easier to do when the spar is still free. Used the skinny plate bucking bar that Granger made, which made the two inner rivets reasonable to set with a gun.

Discovered that I next have to match drill and rivet the trim spar gusset. The match drilling part would have been much easier during the first round of match drilling, but the instructions don't say anything about it.