Hey everyone,
I've been considering building a Game Grrl, as they seem easy and cheap(and because I need to practice my modding skills). I have found where to get all the required parts except for the Hip Gear Screen Pad. I have looked everywhere and can't find anything. Anyone know where I could find one?

just get a 3-3.5" lcd on ebay, cheaper and better than a hip gear will be anymore, supply of those kinda dried up.

Sorry, but I know practically nothing about modding, so I have no idea how I would go about powering such a screen... would this run off of 4 AA's?

it will take voltage as needed from a battery yes. You can search around and look up what it draws, then look for the right amount of batteries to come up with the voltage. Example if the screen draws 9 volts. your going to need 6 dubble AA batteries in series (End to End configured) to approximate what you need. (Most screens have voltage regulators to help you do this)

Yeah you can search this forums screen modding section and find all you need.