Before I bought my second chest freezer I used my original (14'cu) freezer to ferment Ales and store my kegged beer. I saw the thread that you linked to, but used a different solution. It was on another thread somewhere on this site.
I went to Walmart and bought a plastic tub big enough to fit a my glass carboy. It believe the tub was around $4 bucks and it was by the Christmas Stuff a few years ago. I also bought a large aquarium heater for $30 at Walmart, but you can get it from PetSmart, too.
As you can see in the picture, I cut out a hole in the lid for the top of the carboy to poke out. I also drilled a hole in the lid for a thermometer. The aquarium heater is beneath the lid submersed in water and it worked great and kept it to within a few degrees. I belive I had the Johnson Temp. Controller for the chest freezer set around 45-50 degrees and the tub of water was kept at 70 degrees with the aquarium heater, no problem