Hi Danny,
I see you found it. Much better in the open than via PM's.
Here is my cable as it goes through the bulkhead by the battery. I used duct tape and a knitting needle to poke it through.
It goes down behind the glovebox, under the fusebox cover, then into the sill and travels towards the rear seat.
There is a hole in the bulkhead on the passenger side to pass cables through to the boot (smaller hole on drivers side)
underneath the rear seat back.
That is assuming of course you are mounting your amp in the boot