How can we make it viable, while remaining flavorful - ie, not a warship? I don't know a whole lot about what's good balance as far as hit points and stuff goes - everything is eggshells for me - but I thought of some possible stuff:
BOFFS: 1xCOM-unv, 2xCOM-sci, 1xLTC-eng, 1xLT-eng, 1xENS-tac 1xENS-unv
Weapons: 2xfront, 1xrear
Consoles: 5xSci, 4xEng, 1xTac
What else? What boff powers would you put in? What doffs? Other stats?
Don't forget the Phasing Cloaking Device! (see USS Pegasus) Would that be a device or console...
The Oberth is more or less a scientific scout vessel, so BOFF powers should play on that theme. IMHO, it would never be a T5 ship. Perhaps as T2 refit or T3 at most. It's just hard for me to see it outperforming a Nebula class. :-)