Clamped and drilled the hinges to the spar. Everything looks pretty good, although the drill bit did mark the bottom skin in a few places as it punched through the top skin. Should have used a drill stop.

Not happy with the control horn on the left tab. Rivets sitting too proud and the hole for the linkage didn't align well. I opted to drill out a few of the rivets and use cherrymax blind rivets. Upsized to 1/8” and lightly countersunk the dimpled horns to accept the larger rivet head. Used the wedge method from chapter 5 to set the cherrymax rivets tight up against the horn. Overall happy with how it turned out.

[update] I realize what I was doing wrong with the rivets - I was pushing the flush set into the corner of the horn and that was causing the flush set to ride up the fillet and not sit flush. Should have known better - that's what I get for taking off so many months of working.