I did mine several years back and let me tell you it is something I'll NEVER do again. It was quite the project.
If I remember correctly the fiberglass cloth and resin came from U.S. Composites, marine plywood from a local place around columbus - I'll have to look it up, lots and lots of brushes and rollers for fiberglass from various paint supply stores.
I think in all I spent about $1400 on everything and no idea how many hours. I can probably write up some lessons learned/suggestions when I have some time or if ya wanna chat.
You are going to need some light coveralls and a good respirator as that fiberglass is nasty. The best tool I found for removing the old floor (especially where the floor is glassed to the hull) was an oscillating tool with a good half circle metal/wood blade. I got the tool from harbor freight but the blade from home depot or lowes. I think the blade was more than the tool, but I went through about 7 HF blades just in the bow of my boat. I bought one good blade for around $30 and it lasted the entire rest of the boat and I still use it today.
I help a guy once. We bought Marine Grade plywood and coated it with shellac. Used Marine Caulk and coated the edges. Screwed it in place and installed indoor outdoor astro turf.
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Did you remove the old floor?