I was wondering; would it be possible to make a modular jump drive, power plant and fuel tankage package and install it in a specially designed cargo bay?
Then you could leave it at some station and use the extra tonnage insystem to run cargo.
Does it need a Power Plant?
In CT, the Jump fuel is the big space stealer (a J-1 drive is 2% of the ship and the Fuel for it is 10% of the ship), so you just need a bay that can either hold cargo or Jump fuel. If it is part of a larger cargo hold, then you need a folding fuel bladder. If it is an isolated hold, it just needs a good door (and a warning light).
You could use a collapsible fuel tank, but not a removable drive.
The jump drive creates a field, so theoretically it doesn't need a port in the hull.
If it is an isolated hold, it just needs a good door (and a warning light).
Does it need a Power Plant?
That's the problem (well one big one anyway) with the jump grid idea though Ishmael. It's not reflected in the design rules. Hulls cost the same regardless of design, Starship or Spaceship. Damage to hulls doesn't affect jump ability. Cost of jump drives don't go up for hulls with more area (due to configuration). Jump grids while an interesting idea just don't work for me.