As the battery is on the passenger side of the car, i decided to run the power cable down that side.
From the battery, mine loops under the washer bottle along the chassis and into the large rubber grommet in the bulkhead, just below and to the side of the intercooler.
Inside the car this comes out behind the glovebox and then runs under the passenger side plastic sill trims, under the base of the back seat and into the boot.
Hope this helps.
Mike