You could laminate 3 pieces of 1/2" ply or 2 3/4's to get that 1 1/2. If on a budget you really don't need to get the more expensive marine or okume pylwood for that purpose. AC plywood will work just fine for that particular application.
When it comes to doing the cockpit floor which will be glassed over, many of the guys I know use MDO.
For more "important" and structural parts of the boat use the good stuff.
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