Fitted all the side bulkheads, arm rest and stiffeners on middle section. Drilled these to final size except for the holes in the skin. Fitted and clecoed the middle section to the fuselage forward section. Prepared forward side skins. Fitted forward side skins, clecoed both R/H and L/H in place. Clecoed all forward skin stiffeners and angles in place. Fabricated rudder stop, control stop and 810,811 angles. Began preparing the aft fuselage bulkheads, 808-812. Located and drilled tailspring bracket to aft bulkhead.