I've seen a reference to the bamboo laminate ribs at Cape Falcon kayaks. If it is the same stuff you mention, it has to work and work pretty well if the guy is using it for his F1.

But I was looking to avoid using ribs and instead just use plywood cross-sections for simplicity and ease of built, not to mention I already have it but not a ful sheet, so was looking to see how can I maximize my available materials.

I'm still on the fence about ribs vs. plywood. I think ribs might be more resilient, but having never bent wood before and since I do not have a planner to make my own planks, it seems easier to go the plywood road for my first attempt at it... Open to suggestions of course -;)

: Make some calls to hardwood floor installers and see if you can get some
: "waste" (unfinished bamboo or oak could work well IMO). The
: planks ripped for fit are what you would pick out (typically 4-6 foot x
: 5/8" thick).

: If it's vertical grain you can likely slice it to 1/4"x5/8" and
: bend (with steam or just heat).
: If it's flat grain, re-saw the cutoffs and salvage as many ~1" wide
: strips as you can out of the laminate.

: I'd be surprised if you couldn't get enough free pieces to both experiment
: with and/or make the 20-30 ribs you might need.

: Let us know if you try this (I haven't) ... not sure how/if the glue used to
: laminate the bamboo holds up to heat and/or water ...