Robert, This is not a 45 size hull. Its ment for a very strong .21 mod O/B. I do have a 36.5" and 40" Nitro tunnel and a 40" Q FE tunnel designed, but lack of time to build and test has paused their release at the moment. Please shoot me an email or call and we can discuss what you are looking for exactly! Thanks, Mike Luszcz, www.mlboatworksrc.com