The cable for the head unit to remote locate it up front is run along the PS, under the trim etc. with everything else. I run most stuff in the plastic "channel" deals, whatever their technical name is.
I got the Yaesu separation kit vs. making my own cable and it was plenty long to reach...I bought the radio from Ham City because they include the separation kit pretty much all of the time. You can see the excess length of cable wrapped up and twist tied to the bottom of the bracket.
As for the cargo mat...That's just the OEM carpet
- I keep it looking decent with a husky rear cargo liner.