To me it looks like a Planetary Bombardment Drop Ship, or a Troop Drop Ship since the tanks look like Pods to me . Plus it looks like it would be from EVE Online for the Caldari Faction. Gallente would make a few tweaks on it
I find the idea of exterior, detachable fuel tanks very exciting, but I do have one technical question: How are the tanks recieved/installed by the recieving ship? There would either have to be some sort of loading crane on one or both ships, or some kind of docking procudure. Other than that, it looks magnificent. I particularly like the elongated body and the rear thruster bank. You really have a knack for this sort of thing.