After asking for a bunch of opinions on wiring and changing up my setup multiple times, I settled on final locations. Sorry if there's big gaps in the pictures, I didn't think about writing up this installation until afterwards, but I'll try to explain what I did to fill in the gaps.
I installed new door speakers a while back so I don't have pictures of that. I used just the factory wiring and didn't run new speaker wire through the grommets running to the doors.
Car ripped apart ready for install.
Simple head unit install. Used the PAC Chrysler harness and soldered the speaker wires onto the appropriate leads on the radio harness. The same procedure was done for the steering wheel control adapter.
I connected the RCA cables and ran the speaker wires and RCA cables down to the passenger seat. I just pushed all the wires into the little space in the picture above and ran them until I hit the carpet of the passenger seat. Then just ran them over to the boot trim on the passenger side and ran all the cables back to the cargo well in the trunk. For the remote wire, I spliced into the accessory turn on wire running to the AC outlet (purple and white wire I believe). The remote wire ran down to the driver side by the power cable.
Now for the power cable. I ran 4 gauge wire through the rubber grommet that leads into the driver side feet area. Pulled the cable through and ran the wire down the driver side underneath the boot trim, along with the remote wire.
I only used one 4 gauge wire and ran it to a distribution block near the back to split off to power the two amplifiers. My ground cables were attached to the rear seat brackets.
Next I pulled out the cargo well and positioned the amps to take measurements to drill holes for the wires to run into the cargo well.
After drilling and running wires through the holes
The stock cargo cover didn't sit all the way down with the amps being in the way, so a new cover was needed. I used 5/8 in plywood and traced the original cover then cut it out with a skil saw. Sanded the board down. Next I used some Loctite spray adhesive on the board and covered it with automotive headliner backed with foam. I ended up using a staple gun on the bottom side of the cargo near the corners to flatten parts of the headliner out.
Infinity Reference 1600a Amp
Rockford Fosgate R300-4
Pioneer 3400UB head unit
Polk Audio db561 door speakers
MTX TR5512a 12 in sub
4 gauge rockford fosgate amp wiring kit
14 gauge scosche speaker wire from walmart
12 gauge speaker wire running to sub