My 5/8" floor is spanned across two stringers and is solid.

I weigh 230 and the floor is 19 years old. Use 3/4" if ya worried about squishiness.
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dont underestimate the strength of a layer of glass mat across the top and bottom as well.

Probably why mine is solid. Mine only has mat on top just resin on bottom.

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I was planning on using resin on the bottom and glass on top also.  I bought 2.0 oz chopped strand mat, think that will be strong enough?  Also my transom is leaking around the pump, should I put some new glass there also?  Thanks for the help

If it's actually leaking around the pump you don't want to do any fiberglass until you remove the pump and see what is going on.  It might only need to be resealed with marine silicone.

Ok, I'm gonna pull the pump this weekend and see what needs to be done to fix this right.  I'm a little irritated because the floor has already been replaced once and it obviously wasen't done right. I'm a little scared to see what the transom really looks like once i get the pump out.  Truth is I've got a lot of work to do on this boat to get it restored and i'm gonna do it right.  For right now though I'm only concerned with getting the boat solid again, getting the floors fixed, the transom fixed, any leaks fixed etc.  The only issues i've had with the motor is the starter took a shit on me, while I was floating down to pirates cove and thats not even the worse part.  We ran out of beer an hour before we got a tow to topock.  Once I get the boat solid and mechanically sound then I'll start working on making it pretty again.  I'll put some pics up that I have now, and when I get back home I'll take some more to show the progress.  Thanks again you guys for the help.  I'm sure I'll have plenty of more questions for you as I go along.