Wrap Positive Cable w/ Battery Relocation?

I'm kinda curious about why you guys are running these heavy gauge wires through your interior? All my buddy's at the drag strip, including myself, have run the wires along the frame rail using rubber isolated clamps. IIRC, NHRA rule book says that you cannot run the wires inside the vehicle when the battery has been relocated to the trunk. I have to double check that rule, but i'm almost positive about that. sheathing on the wires wouldn't hurt though.