I have a 1972 VIP 16ft that was taking in a large amount of water on Sunday. When I put her back on the trailer I found a 1ft long crack in the fiberglass on the bottom of the hull. The floor above that crack is pretty soft and possibly rotted? What will be involved in this repair assuming the floor is going to be replaced, is there anything special to watch out for? Does anyone have an idea of an estimated cost assuming the flooring is rotted?