Well, I snuck home over lunch today to make some loud noises (rivet gun) and I got the trim tab pretty much finished. I have one or two more “hard to reach” rivets to set, but for now, I’m going to call it done and focus my attention on the floors and the wings.
Then, making sure to include the hinge (other builders have forgotten when the time comes to rivet), I got the top of the tab completed.
Okay, so I’m a dork, and I had to get the hinge pin out and get the thing assembled.

Down tab (up elevator trim). I still have some interference here from the shop heads of the bottom elevator rivets, but I'm going to wait until I'm rigging to sort this out any further.
A quick hour over lunch. 34 rivets set, 2 drilled out.