I've found a PS3 broken on ebay that i will be able to fix with some spares.
Im going to break it down and than mount it in a clear perspex case under the seat, the ps3 give bluray dvd, games with wireless control storage for movies games music pictures etc.
All this for a bit more than it would cost to buy a good dvd headunit.
As you can see i have mx reflex playing on the headunit.
Size is a big thing the ps3 is massive, so instead of using the powersupply and a inverter im going to throw out the PSU.
PS3 has these voltage inputs
+12v
GND
+5v
+5v
GND
GND
+3.3v
In that order of the ribbon strip, You can get micro ATX power supplys that run off 12v for pc that has a rating of 200watt well above the usage of the ps3. That provides all the voltage inputs you need plus a external power for a larger 3.5inch HDD instead of the laptop HDD they come with which are expensive for less storage.