I'm assuming you don't want to work from the inside of the boat, so if your options are 1.25" core plus a lot more inner skin glass or only 1.5" core, I'd go with building up the inner skin and a thinner core. Penske (or any structural foam) has a fraction of the compressive strength of plywood, so you'll want the extra glass on the inside to help distribute your outboard's fastener load.
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