In the wiring picture, if you look closely, you can see two large Velcro pads on the rear cabin wall. I have a HTPC case that takes this motherboard and peripherals and fits nicely behind the seat with the back up and locked. The power amp is behind the other seat back, and all the radios are in the under-seat storage beneath the PC.
Definitely no shortage of room in this truck! Using my original Atom board, I can mount everything except the power amp under the seats...without removing the jack.