What year is your 27? Is a Mk 1, with wooden toe rails on the edge of the side deck?
From the pictures, the laminate that you refer to seems just to be for the back of the cupboard to the underside of the deck, so not part of the structure. There were sometimes galvanised mild steel square reinforcement plates under the nuts for the fixtures for some of the deck fittings. They could have rusted. All 27’s had 1/4” galvanised roofing bolts fixing the inner half of the rubbing strake the the hull/deck flange. They inevitably rust over time, especially if the wood has become too “ripe”.