In terms of weight, the best answer that I have been given is the fact that the hulls are hand-laid (and thus vary in weight), and depending on the age/condition of the dyes, the aluminum extrusions may vary in weight.

As Matt said, we'd all much rather have a boat that has to have corrector weights added to it. Most boats gain weight with age (water in the hulls, etc.).

And as Scooby mentioned, compliance with ALL class rules is something that needs to be controlled after the boat leaves the factory. Good examples are length of the H17 centerboard lines, purchase and setup of the H16 downhaul, etc. which have been watched carefully.

Mike