How would one get power to the x-box after hookin it up to an after market DVD player?

 

Plug it in? LOL

You need a power inverter. Go to circuit city/best buy etc...
They can tell you which model you'll need. It plugs into your cig. lighter or you can hardwire it. It will provide you with 2 110v plugs.

 

Ya, I figured i'd have to plug it in to my cig lighter, which will look ugly, but o well

 

Well you can hardwire it like I did. Just take it apart. :-)
Move the plugs to a desired location, hardwire the power in, and extend the switch.

 

Good plan