Finished up the other bulkheads, and preped them for riveting by deburring holes and edges, and scuffing and cleaning with MEK and finally priming. Fabricated and tapped tail tie down. Riveted all the remaining bulkheads together. Cleco'd tail skin to bulkheads 711 and 712, and cleco'd 707 and 708 to the aft skin on the sawhorses.