Probably a silly question, but have you changed the vehicle to "Mustang Hi" and rebooted?
Unfortunately no, without a recovery option, it's too risky to test. It ties into an apk called "EventCtr" which will cause a boot loop if modified.
I wish it were that easy, it's not standard hardware in there like a tablet would have. There are separate boards for several things. I would personally be more interested in decoding the CANBUS stuff they did, because it detects when doors are open, RPM, turn signals, etc. That RPM information alone could be used to fabricate a cool shift light..
2nd gen is all-in-one... the dash/screen/hookups are all one piece. The other version has it's own little hardware box that runs off of the unit. Quite honestly, everything is plug n play. Wiring it's self explanatory as you can only plug them into the right connections, otherwise things wouldn't fit. You will have some wires left over that you won't need to use. I think I had 3 sets of aux/rca cables and I didn't use the antenna plug.
http://stangatx.cf/
Just take your time. Pulling off the dash trim was the only thing that worried me because I hate breaking clips on plastic crap. There are some basic, non Tesla head unit install videos you can watch to see what's needed. Also remove the hardware that holds the shifter/center console in place so you can slide it back to give yourself more room by the unit. Just make sure you test everything before bolting it back into the dash heh.