Sorted I reckon the next one will be a bit more indoor anyway as it will be a tad colder in November, so with your help we can have some tunage.

You can run powercables, RCAs and speaker wire next to each other fine. As long as the ground point is good and the RCA are shielded there wont be any problems. Iv ran all cables next to each other since my 1st car and never had an issue.

still way more hastle to lay it thru the fire wall and under the trim than down the back and along the brake pipes imo. power is in the bay and needed in the boot. easy to just bypass the cabin.

now all the wires that start in the cabin stay in there. also, a friend set his car alight by putting power cable thru the cabin. chair clip came down and severed it. as such i like it to be tucked away between the body and the brake pipes.