I’m in the process of removing them myself from my 2013 R-29. I took the copilot seat apart, labeling each piece carefully. The stern seat-back screws are accessible as AG Lyme indicates. The portmost seat-back has 6 screws behind it on top. The middle one has four screws accessible behind it in the cave (pry off the white screw caps to see the screw heads). The starboard-most seat back is accessible by removing the breaker panel—there are 6 plastic caps that pull off concealing 8 screws holding the panel on. Behind that are the screws holding that seat-back in place. After that I was down to just the seat bottoms.
Chat-GPT and I argued for a couple of hours whether the stern dinette cushion was held down by glue, screws or Velcro. It finally convinced me it was glue and I needed to pry it off…which I did…discovering it was really held down by a dozen screws from somewhere inaccessible below. (I will now need to cut the screw ends off.). For the foldable copilot seat bottom I’m sure I’ll need to use AG Lyme’s trick of removing the beverage cooler by first removing its screws behind the forward cave wall—which isn’t too bad to do if your first remove the the screws holding that in (look for the white screw caps in the cave wall).
Chat GPT recommends reattaching the seats using some sort of industrial Velcro, which I’m considering. The seat bottoms don’t seem to me to require the overkill of a dozen screws to prevent against what is mostly horizontal movement as you slide in or out of the dinette. Clearly this was an early design flaw and of course it was with the model years that used poorly made leatherette that fell apart. No one expected to have to ever take those seats out.
I’m in the queue for reupholstering this winter for around $3,800 inclusive but I have to bring them the seats for reupholstering. We had a quote in Everett for ~$6,000 but that may have included removing and reinstalling the seats. I can’t recommend anyone because I haven’t seen the results yet.
Good luck.