So I tried similiar approach just to try how hard it was... It's not the same thing, but this kind stuff actually wasn't that hard in my opinion and it was also kinda cool. You just layer a lot of small stuff and turn them down so that you can barely hear them (and most people won't, unless they really focus). I didn't go all nutjob with this one yet and this one is pretty minimal, it has something like 4 guitars, a bass and 7 midi patches.
http://dl.dropbox.com/u/1338211/ahjteam_knucklehead_test.mp3
http://dl.dropbox.com/u/1338211/ahjteam_knucklehead_test.mp3