Coleman 48 Can Party Stacker is a good choice: 1) it’s insulated, so it minimizes the work to maintain temps 2) eliminates evaporation 3) fairly easy to modify - just need to drill a large hole for your device 4) can accommodate large cooks (I can do 4 whole pork ribs at a time)

https://www.amazon.com/Coleman-33-Quart-Party-Stacker-Cooler/dp/B00363PTMC