[Warren]

The deck and house sides typically have a variety of wood core material , plywood, Mahogany blocks, end-grain balsa. The build plans might specify . Hulls vary but tend to have less core below water line more in topsides. Typical for all Asia builds.
A knowledgeable surveyor or fiberglass expert should be able to look in bilges and lockers to see if there is coring if they know what to look for.
Slightly destructive investigation could show more if you see coring where you might not want to see it and possibly the condition.
A real condition survey could and should include pulling a thru hull or keel bolt , or even fasteners from fittings like a suspect cleat. But 99.9% of all surveys are observation only unlike commercial surveys that can be a lot more comprehensive, and expensive of course.

[Warren]

Hi, I don’t know the norsea 26 . If you intend to race the boat under a portsmouth rating , the only reason to need a number your local club fleet or administrator should start with an estimated number by comparing to similiar boat. After that a number can be established by submitting numbers to us sailing . But it will take along time as ussailing has not updated their numbers for years. They have basically abandonanded the rating system .
It is still well used in the U.K. But mainly for their local boats.
The rating system works best for small boats that are raced regularly.
Hooped that helps. Warren

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