> So the bottom is unhappy with the seat. Too bad, I was going to try those.
> I have a plastic chair, off the top of a bar stool or maybe one of the
> commercial boat seats. Wouldn't it be easier to modify the plastic seat
> (cut the back shorter) and mount it to the boat?

The seat I'm taking the mold from is just perfect for me, and I'd love to be able to duplicate it for my future boats. It's amazing how much more enjoyable kayaking is when you're actually comfortable (as opposed to not uncomfortable). Building it myself may take longer, but building is half the fun!