No kit fits any car perfectly without a plate to go around the unit. Are these plates available? Yes. How much? Should be less then $30, even though it's just some black plastic.

I have a double DIN on my 98' Maxima SE 5 spd as well, and I am actually buying a pressure sensitive LCD screen to install in mine. I am going to run a hard drive, ram, and pentium 3 processor on it. It will be used to run MP3's, nitrous controls (remote bottle opening, and arming), and depending on what suspension I get, I may also have it adjust the shock absorbers (I helped my buddy already design such a system for his Koni adjustable shocks).

About the only drawback I can see is boot up time. Even on a barebones system, it will still take about 1-1.5 minutes to boot up. The quickest booting up OS is probably XP, but XP is hard to work with if you want to set up controls for nitrous and shocks.

Your best bet is to go to an auto sound shop that specializes in custom installs. BTW, this will easily cost $3000.