Re: looking for information on hulls
The guys are right... coring takes many forms, covers different areas of hulls, and manufacturers took different tacks at different times.
Among the majors I think Catalina and Beneteau still do solid glass hulls. Others core to the waterline, others right to just about the keel root. You will have to investigate each instance to try to get exact information about each boat.
Probably most boats marketed as 'racer/cruisers' rather than 'cruiser/racer' or 'cruiser' will make use of cored hulls for structural stiffness and light weight, but that's not a guarantee either (eg I think the First series Benes are solid glass hulls)
Good luck!! It's nice to know what you're looking at...
".. there is much you could do at sea with common sense.. and very little you could do without it.."
Capt G E Ericson (from "The Cruel Sea" by Nicholas Monsarrat)
1984 Fast/Nicholson 345 "FastForward"