Uhh, Sandy, I HAVE the Avenger model, so I know what I'm talking about.
I like the nacelle design, it's just that the rear grill stops abruptly too far behind the side intercoller thingy. It needs to continue on untill it meets it like on the Conny. I think the impulse engines should still be on the neck because it would make sense, being a refit. That way, you wouldn't have to reroute as many power conduits and such.
But it's still nice.