It's not about the easiest course of action, if modders wanted to do that they wouldn't mod to start with, they would just purchase something off the shelf.
Yes the Ouya board would need a Hdmi attached screen, power , plus a few other things, but it should make for a cool little handheld that can run Ouya market games - well it is an Ouya , which was the point - ie to have a Ouya handheld not a beagleboard etc handheld .
I get the feeling Ben Heck is already on the case though. Will have to watch that space in the time before getting one myself.