After building an 18' Chesapeake last year I am gearing up to build a 17' Guillemot from scratch this spring. I am interested if anyone has experimented with using materials other than plywood (marine or otherwise) and or strips (e.g. Cedar) to construct a kaytak. Thinking of weight and cost effectiveness I wondered if anyone had attempted to use strips cut from rigid foam insulation such as owens corning FOAMULAR(registered)? It may sound wacky however the material can be cut with a variety of tools and could probably be routed to accept a cove & bead. Once covered inside and out with glass and expoy it may potentially be strong enough. Likewise the cockpit could be re-enforced with 4mm plywood for additional strength. It's obvious that the craft would require painting or it could just be left ugly.
Just an idea. Anyone with experience?