I squeezed about half of the top rivets with the aileron anchored flat to the table. Skip rivet around the structure to spread out the riveting stresses. Next I propped the aileron up so I could begin skip riveting the bottom. I continued skip riveting top and bottom until I ran out of holes. That was satisfying!
The aileron came out straight and flat just as intended. I’ll attribute that mostly to luck and great hints from the builders that have gone before me. Thanks Guys!
The blue tape on the top hinge gussets were to remind me not to rivet these yet. Eric Newton said (in hindsight) that fitting the ailerons to the wing would be much easier if these were left off for now. I’m going to listen to his experience and give it a try.