Here's the finished product and it works great...
It's just velcro'd to the lid of the keezer so that the hole in the spindle base overlaps the hole for the draft tower.
Here's my idea and I'm currently building it. I'll show some pics when done
The Idea:
Build an efficient draft tower cooler using items from around the house for cheap or free.
The Parts:
used CD spindle with lid
80mm case fan from an old computer
old wall wort (12v DC 1a) had laying around...