Further theorycrafting with O-Lefty-
A primary module providing living areas / survival support, with a rear modular and changeable facility for Ore refining, Quantanium processing, Gas Processing, Storage areas, Ground Vehicle Bays (The ROCBox!).
Primary Module would be either at the front, or on top, with engines projecting out to the side to be free of the modules (On top would allow for planetary landing better).
This would allow easy temporary outposts; allow a level of self-sufficiency for medium/long term mining operations that don't call for an Orion. You could also tailor the ship to the needs. If it's a short trip away, you maybe don't need the quantanium refinery, say. Or if it's purely in space, you can leave the ROCBox at home.
This would also make it easier to higher a fighter escort- a lot of fighters don't have much in regards to living/survival aspects- a lot of the best fighters are JUST a cockpit. A mobile hub like the Nomad could allow fighter pilots to operate in shifts and extend the duration of the escort.
EDIT: This post in no way reflects a belief or expectation on O-Lefty's part. He merely helped me flesh out a cool Idea that I HOPE will be the Nomad. Again, this does not draw on any evidence, purely hope and dreams.