Actually, from '87 to about '89 or '90, at least SOME 23' Walk Arounds got plywood inside their stringers. Doesn't appear to have been any weaker, though, It's like they used uncoated/raw plywood as a form to make the stringers, and didn't plan to have a release agent to get the wood out so just used them as-is.
I've seen this in only two boats, personally, and I've never seen this in any boat except the WA's. I saw this in our fiberglass shop at the marina where I worked, because one of these boats was hit from behind while on a trailer, requiring a completely new transom and motors, and the other was a gunwale & cap repair from having a tree fall on it.
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Common Sense is learning from your mistakes. Wisdom is learning from the other guy's mistakes.
Fr. Frank says:
Jesus liked fishing, too. He even walked on water to get to the boat!
Currently without a SeaCraft 
(2) Pompano 12' fishing kayaks
'73 Cobia 18' prototype "Casting Skiff", 70hp Mercury
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