Checked to ensure spar had no twist; riveted open rivet holes with A5 rivets. Started with main spar in the center, and worked outward. Removed spar clecos and then riveted the every-other-hole empty spots.
Riveted the aft rib / upper skins; again, starting in the center, working down each rib then alternating left and right from the center.
Finished up by riveting the nose rib skin; started in the center, then alternated left and right.
Riveted the root rib nose skin on the bottom; could have done this earlier, but wanted to study installation options.
Just need to rivet the trailing edge and install the fuel tank.