I have an extra kegereator I picked up on CL a while back that I have been using as a fermentation chamber. I have not used this keg yet, but my old keg I could lift and swing it in there with out too much effort when it was full with 10-12gallons. It was too much to try to get into my freezer chest, I tried that once, and only once.
This is basically the same thing as a SABCO fermenter minus the drain valve and bi-metal thermometer. I plan on adding a Thermo well and racking using CO2 so I wont need the valve or the thermometer.
I'm also playing with the Idea of adding a TEC (Thermoelectric Cooler) to the side like More beer does, and making it independent of refrigeration. If it all works out well I might get a couple more and ditch all my glass carboys.