Unless this really is the Griffen, and it is in pretty good shape, if one makes an attempt at modeling the Griffin, it will be hard for anyone to prove you wrong! One way is to take a published drawing or sketch of what some historian believes the ship looked like, and model it as that specific guess. I know I have seen author's sketches of what it may have looked like in several Great Lakes histories.
I actually have such a work under way myself, so I hope what they found is indeed the Griffin, and there is enough left that we may finally know what it looks like.