With painting all done, I can now assemble the seat backs.
Picture 1 shows the Seatback Brace Hinge riveted to the Seatback Brace. As far as I can see, this provides for two possibilities of seatback angle, or maybe it is adjusted in unison with the selection of where the seatback base is attached, so the seatback is always at the same angle. Dunno!
Picture 2 shows the matching part of this same hinge that is riveted to the seatback.
Picture 3 shows the bottom hinge riveted on, with a brace behind the seat, together with one of the upright Seatback Angles. The very bottom hole of this angle is enlarged with a number 11 drill for a nut and bolt. Don't know why - I assume additional strength must be required here. The kit only contains two bolts, and two per seat are required. I robbed a couple from the remains of the empennage kit - not sure if this means I will be short elsewhere.
