Hey, I just found these two links about this, and thought it might help. If not, just some good reference material!
Scroll down to the Sovereign...
http://www.ex-astris-scientia.org/schematics/starfleet_ships2.htm
Or if you are lazy, here are the two hits I was talking about. One talks about the ATM/ERTL model and the other about the differences in the ship between the two movies (The differences are VERY slight though, from what it says. And most people probably wouldn't catch it)
http://www.ex-astris-scientia.org/enterprise-e.htm
http://www.ex-astris-scientia.org/schematics/enterprise-e-modifications.jpg