Here's the front of the first prototype rock station, all nice and shiny. I put the solar panel(s) on the front so I can see how powerful the complex is.
[ external image ]
Here's the back, showing all the bits that customers don't need to be seeing or more importantly flying drunkenly into.
[ external image ]
I discovered this by on a hunch putting the asteroids infront of a much larger complex, and noticed a significant, but not significant enough improvement. This is the first station I've built with this principle.
Next step will be to make a geodesic dome of asteroids and fill the complex inside it.

HTH
TL:DR - cover your complex in rocks, for more FPS.