The Carboy sits on the bottom I didn't put any risers or anything. I did remove the fan from the inside on the bottom to make it sit flat. The fan just helps circulate air. Its really the water blocks around the top that help hold the temp.
So I took a round Pepsi Fridge and converted it into a fermentation cooler and brewed my first batch on Saturday. Its bubbling nonstop out of the air lock three hours after racking to the carboy. Here are some pics and a quick video. I took the Pepsi/mt dew logo off and plan on painting it...