Speaking of the Farragut, something occurred to me recently: Now, supposedly, they chose to retcon the Melbourne in "Emissary" as being an Excelsior because that model was more detailed, having been built for a movie.
Which is rather strange since the Nebula model was still good enough to later use for that lovely flyby shot at the end of Generations, which would've been seen on screens MUCH bigger than "Emissary" was ever seen.
Actually that's a completely different model. The Nebula model didn't premiere until the next season's "The Wounded". None of the parts are really the same as the Galaxy. Half the windows on the saucer are missing, custom nacelle pylons, and the engineering hull is much shorter, stouter, and has an oddly-shaped deflector.
The Melbourne was one of three or so kitbashed Nebula study models, made from rearranged Galaxy-class kits. That particular one has a full-length Galaxy engineering hull and an additional pair of little Galaxy nacelles back on the fantail. EAS has a good article on it here. http://www.ex-astris-scientia.org/articles/proto-nebula.htm You might have to copy-paste the address because of hotlinking protection.
I'm aware of that. I was curious why they didn't use the model in use since "The Wounded" for the Melbourne in "Emissary", or just make it a different ship altogether.