Thoughts on this Son of Ferment Chamber?

All,

While browsing through craigslist, I came across this "Son of Fermentation" chamber. I have never seen one built like this and was wondering what your thoughts are. I can't decide it the design would work better or worse than most builds. The sinking cold are would definitely help keep it cooler inside, but would you be able to regulate it as well? It seems as though there would always be cold air sinking into the ferment chamber. I like the design as far as how it looks, I'm just not sure it is designed to be as effective.

To make matters worse, this guy is asking $230. Doesn't seem too smart when I could probably buy a brand new mini fridge for half the cost.

If it were me, I'd just spend the money on a mini-fridge.

I am not considering buying this; I am more interested in the design. I have plenty of spare wood and insulation from my keezer build, so if this design is just as effective, I may try and build a similar one. It would probably cost me no more than a $15 temp controller.