I was struggling for hours to figure out why my wifi wouldn't connect until i saw my fat finger
instead of wpa-conf /etc/wpa_supplicant/wpa_supplicant.conf I had
wpa-conf /etc/wpa_supplicant/wpa_supplicant.confg
So the /etc/network/interfaces couldn't find my supplicant info
auto lo
iface lo...
Here is my build
https://www.homebrewtalk.com/showpost.php?p=7479125
There are also a lot of good ideas in this thread
https://www.homebrewtalk.com/showthread.php?t=172047
Necessary, I have no idea. Most people had them so I figured it made sense. The theory is it keeps the air moving so the warm air doesn't rise to the top of the keezer. This should keep a more uniform temp inside the keezer and also help to keep the beer lines cold.
Looks great! I'd get the temp probe into a bottle of water to more closely match the beer temp. Also consider adding a small USB computer fan to regulate the air temps and help reduce freezer cycles.
I had the same issue. It's hard to tell from this picture but I just used a straight edge and blade and cut down 3/4" all the way around. Then I siliconed weather stripping on top of the insulation. This allowed the lid to close and the weather stripping provides a better sealer than the lid...
In case anyone else is attempting this project I was able to fit 2 of these 3 gallon cornies
https://www.kegworks.com/ball-lock-homebrew-cornelius-keg-3-gallon-single-handle-new
Into this 70qt cooler...