Started by cutting the bulkhead to length, then cutting the doublers to length and trimming them to size. There is a shim/doubler that needed to be fabricated that supports the bulkhead (see photos.) Next I clamped the F-705 B section, the bulkhead and the doublers together to drill to size. After double checking all the rivet hole alignment, I moved on to the seat belt brackets. I finished the first one of four when I finished for the day.