When we first moved in to our new home, Dan knew he really wanted to get the compost going. The cost of buying a fancy, rotating compost bin is ridiculous so Dan got to work making us one. He bought a couple used 55 gallon barrels for $23 each and used Google Sketchup to design it. Here's a pic of it as well as the sketch up file of the frame to hold to barrel.
Notes from Dan: "I used a galvanished steel pipe with two plywood discs on each end bolted to the barrel. Drilled holes in to let air in and cut a door on the side. Bought hinges and a latch to keep it closed. Overall, it cost us about $50 to build it instead of $190.00 to buy one locally."