I just wanted to say thanks for organizing this. As my first time chipping in to one of these, it was a very smooth process. I look forward to meeting everyone!
http://www.lowes.com/pd_75729-33112-LCM050LC_0__?productId=3042385&Ntt=chest+freezer&pl=1¤tURL=%3FNtt%3Dchest%2Bfreezer&facetInfo=
That's the freezer that I got. It fits 3 kegs and my 5lb tank. Not sure about the footprint of the 20lb tank. I have a 6" collar and would recommend an 8"...
Toxicity is a dose response. Reason U.S. uses flouride is because it is effective in the pipe after water treatment. It's been a while since those classes in college but iirc the risk of using the flouride is quite low in the concentrations we use.
Do you have a fan in there to move the air around? When I built mine there was a serious temperature differential from top to bottom in the freezer. A PC fan spliced into an old cell phone charger solved that pretty quick.
What is this "little convention" you speak of?
I live NE of Philly in Bucks County, use Wine, Barley and Hops usually. In Feasterville. Princeton Homebrew is closer but I had a few odd experiences there so I stick to the other one.