Yea, my carpenter made two for me out of plywood and two inch styrofoam lining all sides. I'd say volume was about 200 qts, which was too big in retrospect (after they were built) 'cause when full they were not one-man capable. Even empty they were tough to handle.
But my church borrowed them every year for youth retreats to go out west. With ice things stayed cold for 3,4 days (with a spiget down near the bottom for draining). With dry ice, you could count on a week in warm temps. They took mant elk home in fine shape but I finally gave them to the church.
I find two 150 qt Igloo coolers pretty much do it for me now.
