When I was running IT with the battery located in the stock L/F location (VW Scirocco), I used a standard Killswitch with alternator ciruit located about 6in. from the battery. I had made mounting bracketry that allowed me to use a push/pull cable to the handle and ran it to the dash to the left of the steering wheel. This made for a compact handle on the dash and no hot wires running into the car at all. This setup made for no more than 6in. of hot battery cable when the switch was off.