Many years ago when I was a kid, my dad got this old drink box that stores used to ice down bottle drinks..it was about 2 ft x 3 ft and 18" deep....it had 4 legs....nothing complicated, just dirt, add some red wigglers, keep a wet croaker sack on top, and the lid of the box on it to keep it out of the sun...every now and then throw some corn meal or coffee grids on top of the dirt...the key is keeping it moist...for your box, I would raise it off the ground....we never had a problem with ants that I can remember....guess you could spray around the bottom on the outside...good luck with it...