Cleco the R and L Center Section side plates to the Fwd and Aft Center Section Bulkhead assemblies. Cleco the bulkhead side channels to the Center Section side plates. Bolted the fwd fuselage bulkheads to the attach angles, Inbd Fwd Seat rail supports and Otbd Fwd Seat rail supports. Bolted the control column mount to the fuselage bulkheads. Riveted all structures. Fabricated the seat floor angle from steel stock. Primed this structure. Riveted the seat floor and seat floor attach strips to the seat floor angles. Added nutplates to these structures and set them aside until later.Prepared the mid seat rail supports deburring the edges and final drilling all the holes.