Prototype finished! this took about 5 hours to hack together... and yes, HACKED! i did this in my apartment. i have no garage right now, so drilling actual mounts and cutting metal properly is not much of an option.
but this thing works!
now i have to dig up a router so i can get android remote control going. for now, this will be a headless computer! everything can be controlled with an android phone within wifi range. actually, using a phone is a lot better then trying to use a touchscreen off hdmi- seriously!
inside, there is a Raspberry Pi model B, 120GB spindle drive 2.5", a step-down dc controller and a SATA-USB adapter. had to do some interesting things to get it to all fit, but its there!
the case is from a gutted itx power supply i got for 99 cents on sale from coolermaster. i used the guts to get a flatscreen tv working after its power supply failed
out the back, there is voltage input. it can be anywhere from 5v-35v. then there is the rca outputs that will go right to my amps, and thats soldered right to the headphone jack on the pi because the connector wouldnt fit otherwise. and i stuck a micro USB cable out the back too, so it reaches around to the front to power the pi. this way, i can easily pull that out and use any usb power i need for easy servicing when this is outside the vehicle.
i plan for this to be on 24/7! because the pi automatically ramps down power usage when idle, and because the hdd does spin down when not in use- the idle power of this thing is less then 100ma. but, just in case, ill be adding a $30 solar trickle charger... why not.
the only trick now is to get my android phone to send an ssh PAUSE command with taskter when the ignition is off. this will let the pi go to a low power state. when igintion comes back, it will send a PLAY command, effectively starting right were it left off.
exhausted! will continue to update over the next few days