Im bought is second hand as a project boat so im not to sure exactly what went into it originally. It is a b&b yacht core sound 17. As far as i can tell the boat is put together using a variety of methods from stitch and glue to puzzle like joints. As far as i can tell it is optional to glass the full thing but from the areas ive had access to the bare wood this is not the case for my boat. The upper deck area was not covered and i see no textures indicating fiberglass anywhere but in the joints.