Seatbacks after assembly
This was nearly painless. I’m still not sure what to make of the hinged do-hickey on the back of the seats; I’m guessing that it will hook over a supporting structure that is not yet installed. The only thing that wasn’t ‘by the book’ was the riveting of the lower hinge where it mates to the one on the seat pan. I left that hinge clecoed and did a test fit before deciding to rivet it permanently in place. As it turns out, they went together perfectly, both on the front and the rear hinges lines.