The oberth's 'sacuer' isn't a saucer as much as it is a pod-like thing. Ent, ENT-A, B, C have saucers, the Oberth has something close to it.
If anything I'd like to see a pair of oberth 'saucers' mounted for a stellar obseration ship variant (Or a scout, or a presidential liner, or a shuttle tender, or an auxilurary carrier). Mount one where the bridge is now, the other one at the back. Since Oberth command pods have shuttlebays ringing the outside of the circle, it could send/recover shuttles for multiple missions.
That's just my say. I also say this is one of the most unique ships I've ever seen modled. Kudos!