Cool. Is the fuel station in orbit around Minmus or Kerbin? I can also tell that you don't fly with FAR/NEAR, as it would be utterly impossible to get a refinery like that into orbit between air resistance Dv losses and aerodynamic forces ripping the thing apart.
My moon/planet bases tend to be of the modular snap together design for that reason.
I've honestly never seen the point of having a Minmus fueling base though. All my interplanetary missions launch from LKO (Low Kerbin Orbit) for efficiency reasons, and I usually just ferry fuel from Kerbin to either the mission ship, or the LKO station I usually build. Having one on Duna though... is somewhat more useful.