Are you sure it's going to work as a fridge? A key part of a fridge is it's excellent insulation and air seal when the door is closed. Computer cases aren't insulated and getting a proper airseal is going to be tricky, not impossible, but it's going to be kind of a mess of silicon and gasketing to even get a decent seal.
Not saying it's impossible, but it's worth bringing up.
I'm well aware of the necessities of a fridge. I do have a few ideas on getting it as airtight as possible, but to sum it up, the inside of the case will be sealed by building an interior box of insulating Styrofoam, as well as some expanding urethane foam. For the door i will fill it with expanding foam and carve it, and afterwards will try to find a soft foam sealing band that you can buy at the hardware store for your door.
The cooling will be done by two TEC coolers epoxied to old heat sinks we have laying around here. On the inside i will mound low profile heat sinks and have a circulating fan at the bottom.
The inside will be two slanted pieces of clear acrylic so that my lovely cans of Mountain Dew can roll gently from the upper, loading slot and down to the lower, dispensing slot.
If the case comes with an upper and lower door like the one i posted higher, great, if not i'll find a way to cut the door in two.
all this will be powered by a 300W ATX PSU, and regulated by a thermometer.
I do have access to an electrical engineer and possibly one or multiple 3d printers, sooo there's a decent amount of tweaking that can be done on that side...
The design isn't mine, i stole it from
InventGeek