It is not all that unusual to combine glass over plywood decks with a steel hull as a way of reducing the weight above the roll center. The key is designing the structure one of two ways.
-Either you engineer the decks as a composite with the rest of the boat and so that the decks and their connections are detailed sturdy enough to take superimposed loadings, or else
-You design the hull and deck framing to take all of the sailing loads and the decks only take the loads that are necessary to keep the water out.
I know the a lot of steel guys like steel decks, but glass over plywd decks make so much sense in terms of low maintenance, noise and comfort under foot.
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Curmudgeon at Large- and rhinestone in the rough, sailing my Farr 11.6 on the Chesapeake Bay