Blue Heron, Thanks for the advice. I had considered using a core material and still may on the bottom where the pumps will be screwed down. One reason I thought going with a thicker laminate all the way around is because the chest will have plumbing or screws on every side. Also the box will not be supported underneath. It will be resting over the keel and fastened to the hull on the sides with wings like the chest pictured below has.
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