what thickness plywood? Where is it supported?
If you bed them down to the tops of the stringers (epoxy) and glass it to the sides, then one layer of 1808 is plenty. Use extra layer to tab it to sides.
My sole has two layer 12 ox biaxial tape tabbing to the sides (epoxy), and 2 layers 10 oz woven. I used 1/2" meranti plywood (9 solid veneers), it is also completely bonded to the stringer tops with epoxy glue, also its bonded to frames/bulkheads that span between stringers.
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