[bigeasy1]

I thought about laying up several layers of glass,just in the area as shown in the pics.,making it solid,I had lots of leftover glass but after some thought,i decided against it. Too much weight,a waste of resin and glass,and IMHO unnecessary.

If your talking about pouring a resin mix of some sort in there,i tink that would be a mistake.
You wouldn't get very good results.You'd have to thicken it with something like cabosil,but unless you added other stuff like milled fiber,or chopped strand you wouldn't have much strength.

You would add lots and lots of weight to the boat,The cost would be excessive even with Polyester resin. You'd have to rob a bank to use epoxy,and either way what would you gain?

In areas where you'll be mounting things,use plywood,and the rest,use a core material like foam or balsa,or do the whole thing in plywood.
Done properly,it will last as long as you need.

I ended up using a layer of 1-1/2oz mat then the plywood,then two layer of 1708,and two layers of mat,all which brought it perfectly flush with the original floor.