"All mfg have used coring and will continue to do so for any number of reasons. How that coring is maintained is the issue."
A foam core boat , or a balsa deck is an engineered feature , done with the assistance of a NA .
The top and bottom layers and the core make a structure like an I beam.
Simply slathering GRP over plywood and claiming it as "composite" as done on many boats is a joke structurally.
It was done because pilot houses or decks take a great skill to create a mold that will look good.
The eye picks up slight unfairness , although it would cause no structural problem.
BEWARE , when discussing "composite " construction , some folks play very loose with language.
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