With your set up, stringers plus so many bulkheads, I don't think hull flexing will be a problem. Still, the possibility of hard spots makes it a good idea to spread the load on the hull around the base of the bulkheads, with some sort of pad. I used 4 layers of 1708 plus some thickened epoxy, some guys have used foam triangles, not sure exactly how those went together.
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