Have you tried looking at the Folbots? They are a bit cheaper at least. See Link. Building a folding boat requires some clever work on getting the skin to fit properly and still be able to get the frame in and out. I see a lot of them in the Japanese kayak pages however, so it is certainly possible to do.

> Is anyone aware of where I could find plans for a folding kayak?
> Feathercraft makes a beautiful kayak that packs into a backpack, but the
> cost is way out of my snack bracket and after the zero customer service I
> got after purchasing a rudder from them, I'm toying with the idea of
> building my own. (I'd prefer a Greenland style boat.) Is this a bit too
> ambitious?