Rethink the transom; 3 layers of 3/4 Coosa with glass means your transom will end up being 2-1/2 to 2-3/4 thick and that doesn't work for some motors.
I would also suggest going at it from the inside.
Ditto comment on 1708 - no mat is a better choice in most locations. I wish I could shave the mat off the glass I have.
And Coosa is great in compression (like for through bolting) but it does not hold screws super well unless you put some sort of insert in (seat pedestals)
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