Just a minor concern about your using a fridge as I tried to build a running system inside a running fridge myself circa 1997/98.
Fridges make great cases as far as sound proofing / vibration control.
But only when unplugged / not running as a fridge, only used as a case itself.
The problem when building inside a fridge that is running is CONDENSATION...
Hot parts in cooled air equals water droplets where you just don't want them.
I managed to fry what was back in the day quite a large sum of monies worth of parts.
I can't wait to see what your project ends up like, I am 100% intrigued by this one.

Lots of pictures please...