cloth because of its strength in tension. Another benefit is that while glass may yield tiny shards, Kevlar will not. But glass cloth can be used for inside tie points. I've used it for thigh straps in decked c-1s and have not gotten itchy knees.
I admire your ambition in planning dumping, swamping, emptying and reboarding drills. I roll c-1s and kayaks, but I don't bother with whitewater open canoes. And with tandems on lakes, my strategy is to avoid swamping or capsizing. It's worked so far.
Perhaps it won't matter where you install your tie points, as long as you consider possible maximum stresses. Though I have a Bluewater tandem with a foam core, I don't think much of that construction. If one wants a lake canoe, the maker should arch the bottom more markedly and brace the bottom vertically against the thwarts. They sometimes do that in marathon racing canoes.
Classic Freestanding Rack
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