Now that I think about it, AA's probably wouldn't work, I read on his Xbox 360 WVI he posted this.
Everything runs from one set of batts. 7.4v, stepped up to 12v for the receiver, down to 3v for the controller and down to 7.5v for the screen.
He also said this regarding batteries
You could use a Dynamo or Wind turbine if you dont mind the extra weight. These are Li-Ions but im now using Polymers. Any batteries will work well. You just have to decide whether you like size or money more.
Guess I confused Li-Ions with rechargeable AA's, which are what like nickel cadmium or something. But as I said in my previous post, is that really all there is to it
$20 for the wireless AV transmitter
$10 for a case
$30 for a 7" LCD from Ebay
$45 for an xbox 360 controller (free if you already have one)
$40 for lipo batteries and protection board, etc.
So if you already have a controller, about $100, if you don't have one, about $145. Does this sound about right? I wish he gave his case dimensions and such, it would make it easier to guestimate on the case size. I wish he had posted a picture of the guts.