I just finished building a walk in cooler on wheels. Outer dimensions are 4' x 8' x 7' (h) including wheels. Inside dimensions are 34" x 82" x 65" (h). It is going to be cooled by a LG 8000 BTU A/C controlled by a CoolBot Pro with wifi. I panelized all the walls, floor and ceiling because I was building this on my own. The panels are basically sandwich panels (3/4" plywood, 2 x 6 lumber, 5.5" of rigid insulation (gaps filled with spray foam insulation) and 3/4" plywood). All framing is 16" O.C. The door was custom made to 32" x 60". I will be putting a couple of outlets and a light inside of the cooler. The AC only draws 6.2 amps. These pictures were taken while the spray foam was still hardening. I mainly make lagers so I plan to use this mainly for fermenting and storage. If I need a warmer temp, my plan will be to put a conical heater (or an electric heating wrap controlled by an Ink Bird controller) on the conical and wrapped in a moving blanket.