^^^ This ^^^Two warnings...
a) I am not a lawyer, although I play one on TV.
B) I do NOT speak for Bennington.
Having said that, you're basically asking if you can hang a home-made Bennington sign on... wait for it... a Bennington.
Seems to me your REAL problem is going to be having it come out really nice and suddenly being inundated with requests to buy one from you. Which is a problem mainly because The Powers That Be would prefer not to have any commerce on this site. Oh and, if you sold them for profit (or even at a loss) you WOULD have a copyright problem, or more accurately a licensing one.
T.B. can always come in here and contradict everything I said, and be right to do it, but I suspect that nobody at Bennington is going to care about you having your brother turn out some custom bright-work for YOUR boat.
Hey Guys, my machinist buddy just made me a custom billet aluminum gas cap with a bar on it so it has something to grab hold of to take it off. Will post pics after I polish it. Steve