I'm hosting a party where I'm expecting 175 guests. I'm getting 3 full size kegs (16.5" diameter, 23" tall) that I need to keep cold. Rather than get 3 plastic tubs, I thought I could build one large box out of plywood and/or 2x4's.
Here is my plan:
Dimensions of the box = 20" deep x 24" high x 60" wide
Water level would go up ~20". If I've done my math correctly, there should be about 40 gallons of water in the tub (some of it will be ice). Simple wood screws every 2" on the vertical walls, ~4" on the horizontal. Add some spray foam to the corners to seal it up. Really only has to stay together for 2 days.
Any thoughts? I did some research and people make 200 - 300 gallon aquaria out of plywood, which would have a lot more pressure on the sidewalls than I'm going to get. They usually apply a waterproof epoxy resin to the inner walls for longer term use, but I don't need mine to last that long.