I built my own keg box and it works pretty well. I broke the coil so it made it a little complicated but if you are careful its not too hard. I built a box out of 1/2" plywood and some 2x2's then got a sheet of 2" styrofoam insulation from home depot to insulate it. I filled the cracks with great stuff foam, slapped some shower board on the inside and 1/8" nice looking plywood on the outside. I then added some trim and a tile bar top to make it pretty. For a door I mounted a mini fridge door from the fridge I stole the cooling from. I still need to make a new irish coffin cause mine is short and ****ty looking but it pours cold beer. It fits 2 5 gallons, a half barrel and my 5lb co2 tank.
Let me know if you have any questions or want more pictures