Talk to Altimat. I know his car is a different year, but he should have some good ideas... or do a search for your car. I've seen the Altima dash around here with an LCD in it somewhere around here, so somebody has definitely done it before.
I've taken apart my Maxima dash a million times already, and I can tell you that there's a LOT of stuff back there where you can mount the screen -- at least in my car. I think most people just fabricate the front of the bezel into the dash, then screw the back into the front and call it a day.