Shawn, Tom & Gang:

Fished-up from the discussion below:
The problem being that a sweptup bow combined with an important rocker could bring down the bow.
Interesting building solutions from sites:

http://www.faltbootbasteln.de

see under Hartel-Faltboote, the Aijuk kayak. Also:

http://www.pouchboats.com

See under: Amateur Folding Boat Builder's Corner
See: Three Greenland Folding Boats Projects by Volker Born

Tavvauvusi