hey leon, ive got mine in the boot and am using the rocker cover grommet as you suggessted, i have my cable tucked up high along the inside of the passenger side sill with cushioned clamps.
the cable exits the boot just through the back seat support panel again with large grommet then through the floor beneath the rear seat. hopefully this will appease the registry gods
. i am running a large 780 cold cranking amp calcium battery its a completely sealed unit and has no problem at all transferring juice to the starter..
even though it will be inside a timber compartment i will still be enclosing it in a battery box to keep everyone happy.
dean