Why not just run a air-water IC under the hood if you don't want it visible?
I almost decided to go that route myself, but this car came with a cut front bumper, and i would have a gaping hole there anyway. /ubbthreads/images/graemlins/frown.gif
edit: nevermind, i see you want it to appear stock even when the hood is opened.. that's going to be tough if you want decent plumbing, bov, et-cetera