A while back I came across what was reportedly some Sovereign class concept art from First Contact. It looked like a rounded saucer, very similar to the Galaxy class, with a somewhat Galaxy-like engineering hull, no dorsal connector, and somewhat Sovereign-like nacelles and pylons. There were two or three iterations of this before we got the familiar Sovereign we know today. Has anyone else seen these drawings out on the internet? I cannot for the life of me find them anymore.
Not entirely. I remember the nacelles being up and back, with a somewhat rounder saucer, and I do remember it not being the 'turkey sovereign'. Most clearly I remember a TNG-Galaxy-style deflector dish, a round saucer, swept-back nacelles, and no dorsal 'neck' on the ship.
What you're describing sounds like a fan-made CG reconstruction before First Contact came out. It looks like it was extrapolating from a computer display on some early set footage. Is this the one? I remember that picture being one of the first things we found when my dad was showing me this newfangled internet thing when I was a kid. ETA: And Archive.org has the original website, which would account for the design progression mentioned in the OP.
Yes! That's the ship! Thank you! I knew I had seen it somewhere and there were more than one image of it. I appreciate it!