It might be wise to correspond with Ward Richardson at Beneteau
USA (01-843-629-5300) regarding the construction of the yacht before undertaking any major surgery. If you're finding condensate on the underside of the refer, it indicates that insulation on the bottom of the box is much too thin. The easiest fix would simply add an inch of high efficiency insulation such as aerogel to the inside bottom of the box.
"It is not so much for its beauty that the Sea makes a claim upon men's hearts, as for that subtle something, that quality of air, that emanation from the waves, that so wonderfully renews a weary spirit."