- You should make it 1 1/2 DIN, and also have an adapter to make it fit double DIN.
- Have a spot to mount a slim DVD drive inside (just a slot on the front).
- A little tinted glass or plexi panel and a hole for a led behind it so we could mount IR leds behind it.
- A powered Usb hub( or just an extention) 1 or 2 ports on front.
all I can think of right now