TOPIC: Seat question

The Lone Star project in the garage came with the ad-on swivel fishing seats. I want to get back to something near normal, not original but close. If you look at this picture of the front seat how is the backrest attached to the seat? Has to be strong enough to withstand some bouncing and weight.

Edwardo from the California group posted info and pics of his Mystic a few years ago. I don't know if he still has it, but the seat looked like the original.

Oh man, thank you, thank you. Those pictures help tremendously on some other issues I was having ie the deck. Planning on bright red also with white hull. Now I have to copy the pics and post them by my project. I have not seen Edwardo post anything lately. I would like to pick his brain with questions on how he cleaned up the Mystic, floor, seats, back seat, etc.