I am currently mocking up the wiring, brake lines, fuel lines, etc of the rear end MK4. I need to add several power sources (trunk light, back up light, subwoofers, possibly powered speakers, extra brake light). I am interested in tips or advice on how to run the wires. Should I run them through the Rear Chassis wiring harness? Run them separate in my own harness using that protective tubing stuff? Or just zip tie them back there somehow?