while in horrible shape now, (notice the tap handle is rotted from sitting in the woods for the past 8-10 years, lol ) i made this at least 15 years ago. It was for 1/2 barrels and worked great. we would drape a curtain around it and there was a Corian countertop a friend of mine made that sat right on top we would use for liquor bottles, cups, etc. The nylon drums are really thick and actually hold ice pretty well, probably twice as long as the grey industrial garbage cans we used to use. . I haven't tried but you should be able to get 3 ball locks in there.
Patrick
very nice!