Removing vent boxes

[dcobbett]

I'd like to remove the vent boxes behind the grills on both sides of the hull so I can use the space for bilge pump discharge fittings and add pull up cleats in the rails above the grills.
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Does anyone know if the boxes are part of the inner liner piece, or are they only attached to the hull piece. I've searched old projects/photo's, etc. and could not find a clear example of that area.