G'day
If you are handy with timber ply is the way to go. Depending on the span and supports 10mm would be ample. If screwing into end grain pre drill it will stop splitting. Normal ply (structural) will be fine as marine ply is for boat building. There is no difference in the glue between the two ply's, the timber used in marine ply is the difference, there is no floors in marine ply as extreme strength is required of boat building.
Happy building.
Regards


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