Here are three of the six aft bulkheads (F-807, 808 and 809). Each comes in two or more parts that must be riveted together.

The largest one goes right behind the rear seat. The horizontal slots near the top are where the shoulder harness comes through. The holes in the sides are for running electrical wires, rudder cables, etc.

I had these done a long time ago, but never got around to taking any pictures til today.

Two of the remaining aft bulkheads are all prepped for priming, then I'll rivet them together.