hull layup question

i should know this but dont, on a v-23 hull and i assuming the v-20 also besides obviously having stringers, does the hull have a core glasses into the bottom also with the stringers or is it just a hell of alot of layers of glass laid up on the bottom?
deal is i am inheriting a v-23 but the stringers need replacing
 
V20 is solid glass no core, as is the V21 I have never seen a V23??

My 23 Sea Ox is over 1" thick with a core.
 
The hull is solid glass, no core. The stringers do have a core in them if that is what you are asking though. BERTRAM was the one who used the open coreless stringers, but they had some issues.
 
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