im in the process of building a similar one also using a 32 bottle wine cooler
i tried using one 5" computer fan pointing down and it was not enough so like me you will need one pointing up and one pointing down 5" or 120mm computer fans, you can use whatever you want im just telling you what i used, they were 10 bucks a piece at best buy and 3 bucks for a rheostat from radio shack very easy to wire. hers some pics i took so far see if it gives you and ideas best of luck and post pics when its done!
that big open space at the bottom that the fans are not going to hit is just going to get filled with water bottles
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