Dang Blu don't get mad. Which question?
Stringers- Use Marine Plywood, A/C Fir or Composites. I do not think you will need to double up for the entire length you could get to 9' plus by scabbing a piece alongside and laminating it up with maybe a foot or two of overlap. The 17 looks a lot different than the 20' as the 20's have no center stringer.
What you have done so far looks good.
The piece of floor you cut out- You could flip it and go for the rotten wood from the bottom of the floor. That is what I did. You need a large flat table to work on and once you get all the wood out and the bottom side ground out you can replace with similar thickness wood or composite. I did not go back with small blocks of wood. I like the technique of drilling 3/8" holes every 4 to 6" in larger pieces of core, and weighing it down into two layers of 1.5 oz mat. Let it cure and then grind and glass to encapsulate the core (matt or 9 oz cloth would do the trick). My boat has a full liner so I removed the liner and flipped it to replace my floor.
I would replace the bulkhead that shows any sign of rot and would consider replacing all the stringers. I did not and I now regret that decision.
I was not aware that Wellcraft used 24oz mat? I did have a bulkhead that Wellcraft did not glass in the front of my center console. My boat had 24oz or heavier roven layed into mat on all the stringers and most of the liner was done with the chopper gun.
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