Blu, you may not be getting answers to your questions because it appears from your pix that you are doing a helluva job!!
I have not done much floor or stringer work (only fixing some isolated soft spots on an old Speedliner 17'), but I would think 2 pieces of thick marine ply, glued together, then glassed over, would form a nice stringer.
All right guys with way more knowledge than me, step up and help Blu out with this. He's doing a great job and just has that nagging question or two we all have when tackling a project!
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