I work in HVAC, not refrigeration. But I want to build a walk in cooler to hang deer during early bow seasons when it can still be 90 out. How do I size my cooler? It will be on an insulated concrete slab 2x6 walls foam insulation and 2 vapor barriers. I want to over size it some for a fast pull down. How do I select the proper evaporator? And condenser?