Hull is solid, . . . .
very solid(thick) fiberglass. I drilled new holes near the bow/centerline and found the hull to be over 3/4" thick. Back where I installed a new thru-hull for the engine it was over 1". The entire hull is solid, no coring was used on Cherubini hulls.The decks and cabin trunk are cored. The coring depends upon where you drill. Mostly it is end-grain balsa. But around the portlights and where hardware attaches you will find some plywood. If you are lucky the coring will be dry. But chances are your surveyor will find some(lots of) wet coring. This is not a deal killer so long as you understand where and how to fix.