[Suicide Junkie]

Metal is not often found in large quantities.
Except on a ship, maybe.
What scale are you planning to use for these metal images?
You can't very well make a corridor that is 1 sector wide, unless you're really doing some funky matrix style action with ships or drones being bullets that fly to their targets.

Some example uses are nessesary, or I won't know where to begin with the metal images.