Gardening Tips and Hacks
I built my bins using mostly scrap wood from a new house next door. The builders were happy to let me have the wood, since they were just going to throw it away anyway. I did go dumpster diving in the big demolition bin, so be careful with nails if you can raid a construction site.
There are different ways that you can build a 3-Bin System, and really you could just reengineer from the picture above, but here is a publication from the University of Missouri Extention that has plans for different types of compost bins. It does say that the three-bin system can be fairly expensive (if buying new wood), but it is extremely effective.