Battery in trunk wire routing.

my battery box is in the trunk on the passenger side. i was thinking about running the cable inside the car where the factory ran the rear tail light harness. then into the sill plate wire tracks all the way up to the kick panel area. this is where i run into the problem. i cant decide how to go from the kick panel area and into the engine bay. i want to keep it clean and as hidden as possible while not intruding to much into the passenger compartment.