Here is a reply from KP, the owner of this the inspiring site:
Building a kegerator
> Subject: Re: Kegerator
>
> It works just OK. The main problem is keeping beer cold enough. I have
> a friend that used the same approach but used a small dorm sized
> freezer instead of a fridge and he gets better results. Not sure where
> he found the small freezer, though.
And he adds:
I'm on my 2nd fridge since the first one died after a couple of years.
The second time around I changed it up where I removed the back of the fridge and gently bent the small freezer unit (which is really the cooling unit on these small guys) backwards so that it is outside the main compartment. I then backed up the unit to my cold box so that the metal colling unit is inside the kegerator while the rest of the unit is outside. This way all it is cooling is the kegerator and not the original area of the fridge. This works better than trying to cool double the space.
It works well to keep the beer in the 50s which is perfect for the styles of beer that I like (stouts and barley wines). Foaming is not an issue as you can adjust the CO2 to work at most any temperature (less pressure for the higher temps).