The proof that it is actually a new hull with enough volume for a F18 is that it does not fit the Javelin 2 cradles!
Or it is (more) proof that the Jav-2 hull doesn't have enough volume !
Besides, any meaningfull proof of suffient volume is to be found on the water during actual testing and racing in an F18 fleet.
You will find that that is elementary, my Dear Watson
Wouter