I like using wood instead of foam, bass wood is really light, not as light as balsa wood but close and much cheaper! 1/8" thick birch ply wood also works well, ceder strip canoes are made kind of like this, on it's own the wood is not strong enough and the fiberglass alone would be much heavier but an epoxy/fiberglass/wood composite is really strong! it's also easy to work with and easy to shape and if you need to fill an area mixing epoxy resin with saw dust works well for filling in voids.
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