While i had everything apart i decided to go ahead and mount and wire the amp. Sadly it will be several weeks before I can get the fiberglass boxes built for the subs
I used silicone to attach a piece of plywood to the back wall (remember the 2 strips of blue tape from before
) This gives a sturdy place to mount the amp without drilling holes in the back wall of the cab. Many thanks to UNBROKEN for the tip.
I drilled a hole in one of the plastic knock out plugs for the 4 ga power wire and amp remote wire. Both are run along the frame rail under the truck beside the brake lines and up into the engine compartment.
**EDIT - The remote wire was rerouted and tapped to the power port in the center console since I had to open the center console to run the wire for the bass control for the amp.
I reinstalled the carpet and cab liner, cutting the liner around the amp. At some point i will paint that board black to match the liner but really, no one will ever see it.