Did you look at the pictures? Clearly shows a metal bracket and some black box that would make it impossible to put a unit in any higher.
Yeah, 2100$, plus probably a couple more hundred if you can't install the stuff yourself. ESPECIALLY steep considering it isn't actually plug and play.
$600 just for the dash kit is astronomical. And that unit is probably the only one that fits I would imagine? I'm sure others have 8" screens in the works, if not already out there...haven't looked.
Probably as it's designed, but I work with electronics for a living and that housing could easily be modifed to accomodate a cross member bracket to put the larger LCD on top. And there is NO WAY that housing needs to be that big. I manufacture avionics for Boeing and the main pod for avionics in the 757 is much smaller than what's pictured.