I have a 1994 astro and the floor has rotted out. I have budget and time constraints. I have just about got all of the rotted floor removed from my boat and I have a few questions.

1st, there were screws holding the floor to the topcap under the fiberglass. They were about every 5 inches. Do I need to screw the floor in before I fiberglass it in place? Was this done originally for strength or was it done at the factory to hold the floor in place while it was being fiberglassed into the topcap before it was attached to the hull?

2nd, a couple of the stringers have rotten spots in them. They still have good wood, its just rotten in spots. I don't have the facilities at my disposal to lift the topcap off my boat and completely replace them. If I were to go that route I would also need to remove the flotation around the stringers and then replace it as well. I don't have the time or the money to do all that. My plan was to remove as much of the rotten stringers as possible and leave the solid parts in place. I would then pour seacast into the spots where the rotting wood was and then lay fiberglass over the top. Does this seem like the best course of action seeing as I can't replace the entire stringer?

3rd, I plan on extending the deck to the console. Is there any reason I can't just fiberglass the deck extension into the boat and then just recarpet the whole thing? I figure I can fiberglass it into the floor and the existing deck and then maybe to the console and to the side of the boat. Will this affect the structural integrity or remove any needed flex in the boat? One reason for this was so I would not have to build the deck out of 2x4's. I was thinking I could build a light weight frame and fiberglass over it, using the fiberglass for strength which brings me to another question. How many layers of fiberglass do I need to wrap around something like a 1x1 or something even lighter to give it the strength of a 2x4?