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Hi Stephen
Under NO< NO< NO<, circumstances use anything other than certified MARINE PLY.
Even though it will be glassed in there will be penetrations for bolts and fittings that will allow moisture in and eventually cause the structure to fail.
The transom will need to be between 30mm to 40mm thick usually by laminating smaller thicknesses together with waterproof glue or resin especially if using a larger motor.
The amount of flex and strain the motor will put on the transom will need to be well supported.
Dimi
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