Seats looks amazing!
About to start mine here pretty soon. I've done a couple small upholstery jobs over the years. Including a golf cart seat, a couple chairs, and an engine cover for my parent's boat. All of which already existed and just needed repair/upgrade. The seats I'll be doing will be a little trickier because they're going to made from scratch - nothing to go by but imagination and the Internet, of course. Was just doing a little research to refresh my memory on the basics of seat making and stumbled on this thread. Great thread!! Thanks for taking the time to show us how you did yours.
Also, I like your saltillo tile that can be seen in the background in a couple of your pictures. I have the same in my sunroom. Yours, however, is in a lot better shape than mine. Haha
Thanks again!