whoa!!! that mocked up is, well, huge!
i laughed out loud when i saw how tall that thing is, that will get noticed for sure, no doubt about it. are you running a chiller under the blower now? just wondering what manifold you are running. i am running the old offy conversion, looks like there's a chiller under it, but not. anyway, i think a combination of brians suggestion,(ac unit) and my suggestion,( chiller inside the lower case), just might work, you could stuff the evaporator in the empty case, and lose the chiller, (if you are running one,) wouldn't be quite as tall, but still would get your point across, well, it's fun thinking out loud anyway you slice it, practical or not, have fun!
davey