Surely a ship of that size can't just run of a Lathe Pattern Class 1 Drive that was designed for transports 1/10 of the Mass Conveyor size.

I would have despite the +10 Power reserves it has require at least a Cruiser size Drive just to move its massive engines and hull size, they are at least 12km in length.

Just keep piling on the Main Cargo Holds and Auxiliary Plasma Generators until it runs out of room.