Backriveted the F888 mid longerons to their applicaple aft side skins. It was ackward because this section of the fuse isn't flat so I have to account for a bow as I'm backriveting. The first one (right side) went great, but somehow I got screwed up on the left side and had 10 rivets that were proud. Drilled them out and re-riveted. Then I cleco'd the aft side skins to the fuselage assembly per the plans.