I made a 3 bay compost bin in an hour! I was tired of struggling with the plastic cylinder types that I have, so got busy making my own. I posted an ad for 7 pallets on our town's local website. I got a slew of responses. Who knew that everyone has 1 or 2 pallets behind their garage that they are eager to get rid of? One man was so happy to dispose of his, that he offered to drop 7 off in his pick up truck. (He joked about how happy his wife would be). So, I set up the 7 pallets upright and tied them together with zip ties. Looking from above, they are in the shape of a capital 'E' with a fourth leg on the 'E'. Very easy. I like the arrangement because the three bays are open to the front, making it easy to dump wheelbarrow loads into the bays, and also making it very accessible to turn the compost with a pitch fork. You would have seen this design if you have gone to any nursery or public garden. I think the 3 bay arrangement is standard. I guess the idea is that you fill up the left and right bays first, then when time comes to turn the compost, you dump both into the middle bay. I would post photos, but I still find that process difficult.