last time i used to saw this fridge like pc without a casing in a youtube but couldnt remember what was the title....
they used the black bottle which u can find behind of any fridge, then there is a pipe running from the bottle to the proc ...kinda weird to see such an idea but its was cool ...the whole mobo kinda icy condition with the "asap2" all over ...seem like its been sub-zero condition ...

post the pic here if u done the designing...
good luck...

hope to see your project soon...