Looking at a 1983 Albin 40 double cabin with a Lehman 6. It has teak decks on entire upper decks but no teak on lower decks. Do all these screws go all way through both FG layers? Is entire area under there encapsulating plywood, or what? Anyone have any idea what it takes to remove and FG over? Seems if just remove and FG over would not be so bad but if a rottet core is involved would taka almost twice as much work!!! Help! LOL