As an idea:
3 layers of 10mm/0.394" garolite for a core under the I/O cutout. The middle layer thicker, like lettuce hanging out of a BLT. Maybe CSM in between to make the stack 1.375" That allows a gradual stiffness change away from the I/O cutout, but generally the bigger garolite pieces, the better. Then coosa everywhere else. Kind of a pain to construct, but It gets compressive stiffness and strength where you need it. And attemts to manage a stiffness transition.
If it wasn't so expensive, I would push the garolite out to the first step in the hull.
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