Also - it may make sense to speak with iBiquity regarding the HD radio part, our technology is older than what is available now.
Parts shipping today!
Agree. Start simple. First version would be screen, psu, igep v2 and possibly OBDII or HD radio.
If there's room after that, put a hub inside.
BTW - Rob told me that one of the most popular videos they ever made was the one that was the hacked together wireless screen. This is similar, but perhaps more practical without the battery.
I'd be more inclined to use a Beagleboard-XM, rather than the IGEPV2.