No real thoughts on the stringers, since I've never had to do mine. But I did the floor on my V21 when I got it. I used 1/2 Marine ply, bonded to the bottom of the deck, then I glassed over the ply with 2 thin coats of fiberglass to seal the wood so it would never rot again. (Something that Wellcraft should have done in the first place).
Tip: once you are finished with all your work, the trick is to keep the inside of the boat DRY! That means no water in the bilge, etc. Seal all areas where water can intrude, including your rod holders, any penetrations, and your rod racks. And come winter time, open all hatches and allow air to circulate and dry out any water or condensation that might have gotten in there. Water plus air is the enemy of all wood. Seal your wood and your boat should have a nice long life.
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1987 V20 w/1987 150HP Yamaha on a Shoreland'r Trailer
1978 16.5 Airslot w/1996 120HP Force on a Four Winns trailer
1996 V21 w/1993 200HP Mercury on a Shoreline Trailer
All towed by a 5.7L Hemi Durango.
If God didn't have a purpose for us we wouldn't be here, so
Live simply, Love generously, Care deeply, Speak kindly.
(Leave the rest to God) 
Silence, in the face of evil, is itself evil. Not to speak is to speak, not to act is to act. God will not hold us guiltless.
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