The object was to make a temp controlled fermenter and kegerator as inexpensively as possible, and this is what I ended up with. It will hold four carboys and four pin lock kegs with a little room to spare. Eventually, I'll put a plate and taps over the hole on the freezer side, but for now it is working perfectly (if really ugly).
I got a mid 90's fridge / freezer from Craigslist. It was rusted out under the ice dispenser so that area got cut out and the area filled with expanding foam. To make room for the kegs, I took the inside panel off the freezer door, cut out the edge and reinstalled just the edge with the seal. The shelf is held up with 1/2" allthread that is run through the entire width of the unit. Freezer temperature is controlled by a eBay aquarium temp controller connected where the original thermostat was. The fridge temp is controlled by a 2nd eBay controller connected to a 12v PC fan.
I was lucky in that none of the circuitry in the ice dispenser was necessary for the unit to cool and that a wiring diagram was inside the freezer.
The homer bucket and 5 gal water jug are for demonstration purposes only...
This was the last thing I needed to get back into brewing, and I can't tell you how excited I am!