In the idea I have, the foundations of the mass driver are orbital dropped via automation, then the fine tuning and check-ups are done manually. On a remote planet, is isn't too far-fetched that there would be a way to clear several hundred or less kilometres of track to make a stable mass driver.
Also, the current technology and wikipedia I don't think takes into account of the room temperature superconductors. Also tech in Freelancer is very advanced compared to current tech.