Did you know the Refit-Enterprise torpedo section built for Star Trek II: The Wrath of Khan (seen above) shows up again in Star Trek III: The Search for Spock?
But because of the angle chosen they tried to cheat their way to a full ship. After all this is what that specific model looks like:
There's no saucer and the pylons end abruptly below the neckline. In TWOK that's not an issue (There's also no aft section and the pylons aren't even attached to the hull but that won't come into play).
Here's how it appears in TSFS:
The hastily added saucer effect always looked odd to me, but even more glaring is the pylon which looks both off kilter and doesn't seem to have a nacelle attached to it.