Done! (Still have to get some secondary regulators, and I'm missing a tap handle, but otherwise done!)
I decided the hinges would be on the lid and the collar would stay in place rather than lift with the lid. But I didn't affix the collar to the freezer; I just put some rubber foam weatherstripping around the bottom of the collar and gravity holds the collar with lid attached in place. Then if I need to, I can just lift the collar/lid off, and more importantly, the freezer is in no way permanently modified so the warranty is still intact.
Here's the weatherstripping I used (the collar and lid assembly is upside-down in the pic).
Here's the finished product minus a tap handle:
I installed the taps off to the left not only because I liked the look, but because one more keg will fit in there, so I can drill another hole for another faucet if I want to in the future, and I couldn't have centered four and then added one later and still have everything centered.
It's been running now for about 24 hours. I just added a PC case fan (powered by an old Motorola Razr wall charger). I highly recommend a fan. The temperature differential in different spots in my freezer, especially with the 1 x 8 collar, is way too much without it, and the fan evens it right out.
How is the freezer working with the weather stripping? I am about to build one of these and like the idea of not attaching the collar at all, just seems easier. Does it provide a good seal? Also, what part of KY are you in?
The weatherstripping is working perfectly. Honestly, I wouldn't change anything if I were to build this kegerator again. The seal is fine. Gravity holds it all together nicely.
I'm in Louisville, but I'll be in Lexington in a couple weeks to brew in Kentucky Ales' GABF Pro-Am competition.
I will be at the KY brew off as well! I actually live less than five minutes from the brewery. Maybe I'll see you out there and can get some tips for my build. I am about to get it started in about a week. Do you know what you are going to brew yet for the competition?