A while back I asked Andrew Probert (Yes, the man who designed the fabulous Enterprise D amongst other things) if I could use his intriguing design for a repair tug and MSD-ise it. He said yes.
Here we have his designs.
Note that the lower two decks are reversed and are “upside down” in relation to the rest of the vessel. This is because the bottom of the ship is flat and serves as a maintenance and repair deck. The two supporting decks are orientated to facilitate easier access.
The overall length of the tug is almost as long as the nacelle on a galaxy class ship.