I'd be looking at 3x3 or even 3x4, I guess half the issue for Dillon is that to buy the Dyneema in quantities to make individual orders it's probably not worth it, but if a good design for a prototype was available and enough orders could be placed to sell the entire roll worth of Dyneema it might be more attractive to develop.
It may just be easier to buy a siltarp locally or import a dyneema tarp....
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