I recently bought a '90 vision 180v boat. The floor around the drain has begun to rot away. I also noticed that the casting deck is soft and springy. I was trying to figure out how i was going to replace everything and began looking at the casting deck first. There is a hole in the top of it where i can see underneath the deck. While looking i noticed that there weren't any supporting beams to hold up the deck. This seems to be the problem with it in the first place. (there is no support under it). The lower bottom floor of the boat looks as if it has been replaced already judging by the poorly Fiberglassed edges. This replacement seems pretty straight forward (rip up the old floor put marine ply in and fiberglass back over it). The part im worried about is the casting deck. Since there arent any stringers for support (or any visible ones) how am I going to be able to cut the deck open, rip out the old wood, and replace it not knowing how it should be supported from underneath. ( it seems like if i cut it out and replace it im going to be bck in the same predicament as before; floor sagging and rotted out.) What advice, if any, can you guys give me. Ive read alot about replacing floors but cant find anything about casting decks. Thanks for any help. Let me know if you need any info or pictures of what im talking about.