Thanks Mylo! You idea was a great inspiration.
To answer your concerns:
1. I agree, I will be salvaging some doors from a wine fridge. They are double paned and designed to have good heat exchange properties (Low heat exchange).
Also, as I talked about above, if you have glass doors you will not be opening them all the time to check on how your brew is doing. While glass may exchange heat better, opening a fridge door even once or twice more, nearly negates the difference.
2. This is pretty easy to deal with. The doors on most wine fridges have a UV coating that blocks 99.9% of all UV light. This will also be in a room without direct sunlight. If you are building this without salvaged doors, or with doors with no coating, you can buy it at any big box store for cheap. No skunking!
3. I found a chest freezer that has external LP coils. The heat is not in the walls it is only in the back. That is why this design works for me.