The PSX thing is cool, though I don't know how much I would like using that tiny screen. I wish the GBA would have some sort of video input device so I could use it as a screen for watching TV or even playing other consoles on the road.
If he makes a PSp ver. 2 with the CD being concealed, then I would like that better. The fact that you can use it with a normal TV and have it all held right in your hands it the big benefit. I hope the games don't mess up if you move it around too much.
Did he use a PSX or a PSOne?
He used a PSOne; go to the VCSp page above and check it out (the same guy did both). From what I gather, he's got no plans to make other PSp's, since Sony lawyers would probably swoop down upon him, although he's probably covered under the "Trailer Trash Barbie" precedent.