For a composite sandwich sole (i dont think you mentions if your making a sandwich sole, or a plywood with glass for abrasion Resistance)......stiffness come from thickness of the core. With a proper core thickness, 1208 will support a huge amount of weight over a large span, but it woudl be relatively thin for the top skin for puncture resistance.
For a plywood sole (not composite sandwich), you only need a couple layer of woven cloth for abrasion resistance (and only on the top side). My sole is two layers of 10 oz woven cloth set in epoxy, its extremely tough. I have one layer of 10 oz on the bottom only in places where there is a hatch ( just epoxy encapsulated everywhere else)
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