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In the first picture the rear spar, top skin and hinge are mostly riveted in place. The second picture shows the remaining top skin and rear spar rivets in place.
      You then back rivet the hinge halves to the inside of the top skin. Note that the trim tab doubler unit get blind riveted in as well.

      One other note on the last picture. If you look at the skin section that is not part of the trim tab you will see two light gray lines.  These have been sanded into the surface for better adhesion of the glue for the foam ribs which will go there. This has been done to all the areas that touch the foam ribs.