Check this out.
I solved the heat issue with the back of the fridge with some clever ducting. I also isolated the heat side from the cool side as well as
turned off the intake fans to the chamber so as not to exhaust out the cooled air. After making these changes I had the chamber down to 82* with the mini fridge set to MAX. Not bad at all considering that before setting this up, the chamber was at 94*.
Just for the hell of it I turned the fridge down to MED and went to bed. This morning temperatures are down to 75*!
YES! So now I've set the fridge down to MIN just to see how low I can go. I'm going to put a reservoir of water in the chamber and see what this does for water temps! Who knows this may be my grand solution!
No matter how good this looks I'm going to reserve judgement.
It appears I can't have continuous air intake in the chamber because all this does is flush out whatever air I get cooled! So it looks like I either need to put my exhaust fans on a cycle timer so I can cycle in fresh air every 30 minutes or so (more research) or start looking at CO2?
So the final design? First separate the fridge box from the coils and compressor. Next, mount the setup on the outside wall of the cabinet and route the cooling pan into the chamber. Then all I need to do is aim a fan at the cooling pan (just like my experiment) and that should do it!
What am I missing this time?