heres what i did. i started out with a dremel, figuring it was pretty easy to handle... but it just didnt have the balls to cut through the fiberglass to release the floor. so i switched up to a 4" angle grinder.

cut out the floor, pulled all of the rotten foam and wood, cleaned it all up. cleaned up all the edges, corners, and about 4" outwards with a sander where the new wood floor would sit so new glass would stick.

cut new floor from i think it was 5/8" plywood. i made sure to cut it VERY snug. then i pulled em all out and coated them all in a thin coat of resin to waterproof em. put down some epoxy into the channel where they sit in the hull and dropped em into place, put a bunch of heavy stuff on top of em. lastly i mixed up some resin with a little hardener, enough to give me some time to work with it. put down some glass mat and glassed down the entire floor, and outwards to the hull 4". then once i got everything coated i whipped up a hot batch of resin and layed it down quickly. it kicked VERY fast and the floor is SOLID. slapped down some carpet and good to go for a few more seasons.