I have my laptop bolted to the back of the backseat - it actually straps into a docking station - so the dock is bolted to the seat and the laptop is snapped into it.
All the cables come under the backseat, side of the tunnel then up under the console.
The keyboard, mouse, usb all come up into the console compartment - so I can plug into them if needed. I rarely use these - sometime plug a memory stick into the usb if I want to play some other music.
The headphone output from the laptop plugs into a mini-stereo-to-rca cable that plugs into the PIE adapter - so I can play music on my laptop and have it come through the stereo.
The serial connector from the laptop goes into the AutoEnginuity cable and into the ODBII port - to do the dyno / real-time data logging
The video cable from the laptop goes to a 8" VGA monitor I mounted up on the passenger side of the cockpit....
I have a bluetooth mouse and on-screen keyboard I use if needed.
I use a Dell 'traveler' car 12v adapter (very small) to run from the docking station power port to the 12V in the console's cigarate lighter plug. I added a switch to turn this off/on since that is a constant power source.
I use wireless my my house (4 computer, 3 laptops) so the car connects to the home wireless for updates, ...etc