J Bird,
Many examples of deer coolers on YouTube.  You have to use stouter framing that I did.  Most create some type of ceiling rail to move the deer around when they are hanging.  Realize you only pay for insulation once but pay for electricity monthly.
I would not do it the same way for again.  Since I am carrying nuts and acorns, I would find a double glass door soft drink cooler from a soft drink distributor.
The cool bot is an expensive item - around $325.  The cool bot was invented for farmers and is widely used by do it yourself folks.
Your air conditioner is an expensive item - has to be digital and a 10,000 BTU AC will be around
$300 new.  Don't buy an air conditioner until you get it cleared by the cool bot support staff.
If you can find insulation board in a salvage situation you can eliminate a great deal of cost.  If I had of made mine 4 by 7 on the inside, my materials would have worked out better and I would not have been cutting insulation board with a box cutter.
Getting it air tight saves you cool air and the floor is important because cold air sinks.  I put a plywood floor in mine.
Where two insulation boards join, I taped those joints.  I used foam insulation in a can - it does well where corners are as flush as we wish.
My walls are 23.2 R Value.
I hope this helps.
Wayne