1982 Hydra Sport Project Advice

[REDOER]

Well, first timer here, with a question or two...

I picked up an early 80's Hydra Sport x260 with a 115 Merc and trailer for a project. I found, once I cleaned the deck, bad fiberglass and deck wood in an area about a half foot square, with a 2 inch square hole in the deck about center of the boat, 1 or 2 feet behind the front pedestal deck. I can see the foam under the deck. What is the preferred, then easy, fix? I have heard of folks fiberglassing a new deck of plywood over the old. If I get 5 years out of the boat, I'm good...it has been sitting a while, was running when parked. The trim motor worked fine when I put power to it, the powerhead is not seized, and compression seems good. I know a carb cleaning is in the works, along with a new fuel take, and steering rack. Have not cranked it yet, sprayed PB Blaster in the spark plug holes and am waiting....What did I pay?, let's just say.... It's all about the deal...