I only use the back piece that snapped onto the PSP Phat. I am including a picture so you can see it,
I checked the dimensions on the PSP-2000, but for some reason I couldn't check the dimensions for the Phat. I just ordered a 2000 from Circuit City, and am trying to decide if I should sell the back of the MGS faceplate as well. I know the rest of it won't fit, but I found it too clunky anyways.