You might want to check out this guy's Tahoe. It's a non-walled setup. Pretty big, though. I think I saw he's now up to like 23K watts. Amongst other things he's got a vid of accidently popping some chicks fake eye out.
isnt 6 18s kinda pushin it. do u really need that much? do u think less would get louder, becuz u can actually fit them properly? or the 2dr have more room than i think?