Nick, I made one a bit different from what you posted which may serve the needs of this thread a little more...
(more pics in my gallery of this)
It is much larger than a one carboy cooler so many bottles could be stored. I sized mine for four corny's.
The one I built is two compartment which is optional but I wanted to be able to do two different temperature controls since I am also making wine.
This one is automated and has a 'peltier' cooler on it. It requires a sizable DC power supply which raises the cost of the project considerably.
Due to the size of this one, it can't 'freeze' the contents as the peltier's claim they can on an ice chest sized model but this one will keep the contents at least 20f below room temp.
This would be an option over putting in a window unit and keeping a whole room cooled.