just wondering if anyone here has done Roof mount LCD screen installation?

something similar to this one:
http://www.lindacctv.com/sdp/144757/...68-542616.html

it require only one cable from LCD screen to DVD/CD player in console.

can someone pls tell me from where this cable runs? i mean does it go from door hinge through roof, or does it go from roof to back and then run through floor???