I ordered a new fuse holder for under the hood.
http://www.knukonceptz.com/mobile-audio/inline-fuse-holders/sp/in-line-waterproof-mini-anl-fuse-holder/. This will have a 120A fuse.
The RF P300x2 amp has no onboard fuse so will be using one side of this.
http://www.knukonceptz.com/mobile-audio/distribution-fuse-blocks/sp/bassik-2-way-4-gauge-fuse-distribution-block/. It will have a 50 amp fuse.
My JBL GTR-1001 has onboard fuses so won't run an inline fuse. It says to use a 105 amp fuse at the battery but I'm being conservative on the gain running it at 2 ohm so treating the amp like its a GTR-601 or running it at 4 ohm so a 70 amp fuse will do.
Bought extra fuses.
The bottom of the seat comes out just by pushing back and pulling up at the front.
I have the power wire running down the drivers side and running through the middle as it enters the trunk. My ground point currently is in the middle of the angled metal near the seat back between the floor and the trunk. May change it depending on where I rearrange the amps.
RCA's are down the middle but away from the power. Speaker wires are down the sides away from the power wire.
Now I need to decide if I really need the relay for two amp turn on or not. I will see how it goes without it.
Will look into the wire loom.