Removed the protective plastic film from the underside of the top skin then deburred it. Slipped the left edge of the top skin between the left side skin and the upper left longeron, then began clecoing the top skin to formers 2, 3, and 4. As I came over the top with the clecos, the top skin was tucked between the right side skin and the upper right longeron, and the remaining clecos were installed.
The skins were match drilled (#40) to the upper longerons. The lower end of the station 2 formers were drilled and clecoed in position. After double checking for squareness, the aft deck was match drilled to the upper longerons and clecoed.
The aft fuselage assembly was rotated onto its side and the lower skin removed. The station 3 formers were match drilled to bulkhead #2, then the overlap at the top of this former was match drilled and clecoed together.
The upper overlap on former #2 was match drilled and clecoed together.
Formers #1 were set into position for a trial fit.
