Tonight I continued the riveting work on the left aileron by using the pneumatic rivet gun for the places I couldn't get with a squeezer. The nose ribs are now fully riveted to the spar, and the top skin is fully riveted to the nose skin and spar. I had a few struggles with some of the -4 rivets that hold the main ribs to the spar, mostly due the angles of physical access. What's next? The bottom skin is now the only thing on the left aileron held in by clecos, but I cannot proceed any further without having the backordered VA-140 trailing edge extrusion. Vans still hasn't shipped out the replacement parts that I ordered last week for the right aileron hinge brackets, so I won't be able to make too much progress on the right aileron either. I have a little more I can do on the nose skin on the right aileron, but after that I might start work on the actual wings next.