I riveted the top skin to the ribs. I used a carpentry clamp wrapped in rags as a v-shaped holder to press the skin against the rib flanges. This is shown in the third and fourth pictures.
I riveted the FL-406A angle to the spar leaving the three end holes empty. Then I riveted the spar to the top skin, then the spar and hinge to the bottom skin and then the outboard rib to the skins and spar. Last but not least, I riveted the spar to the ribs using pull rivets.
The last picture shows why I didn't do anything with the inboard rib. I have a new one on its way from Van's. I was hoping it would be here today.
This went a little quicker than I expected. I decided to get started on the control rods for the ailerons.