There is an old saying "Buyers are Liars but Sellars are worse". Based on your pictures along with the degree of total deck delamenation, I would bet that the hull was submerged at one time which supports the tank removal and wet foam.
Keep up your rehab. Another ole sayin "Get Crackin Kraken"
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1978 23' Superfish/Potter Bracket 250HP --------
as "Americans" you have the right to ......
"LIFE, LIBERTY and the PURSUIT of a Classic SeaCraft" -capt_chuck
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