Today I roll formed the left aft lower mid section 60° to fit up with the tail section. I made the baggage door seal angles and attached the rear seat back brace and gusset to both sides. Drilled lots and lots of holes. Both L & R longerons were positioned and drilled/clecoed to both gusset and seat back brace. I fit installed the mid cabin deck on both sides allowing me to match them and the side skins into the longerons. I finished the day by drilling both side skins so they can be dimpled.