I don't know off hand. I know that it starts out being like 12 inches and I think at the top it narrows down to around 4 inches or so. Its not super slanted, but its more slanted than the woody. It sets up pretty well. In my opinion, the screen on a slim cab doesn't have to be as slanted as on a traditional cab, because the screens are usually mounted higher. On most CRT Cabs, the screen starts just above the CP, on Slim cabs, they usually mount higher. There is a 4 inch admin panel above my CP, and the bottom of my screen is 4 or 4.5 inches above that admin panel, so its more or less Eye level, so, no need to angle it much, because Its comfortable to look straight ahead, versus on a CRT cab, where you are looking down at the screen.
A Showcase type cab might make sense given the size of your screen. The first thing I would do is run some games on it and see what is a comfortable viewing distance for you, then build around that.
The problem with showcase cabs is that they are kind of ugly.

If I were to go that route, I would just make a pedestal with the guts of the machine in it, and mount the tv to a wall.