I made compost bins out of an old cedar deck, I cut the boards to 3' lengths, than clamped several of them together with pipe clamps. Set my circular saw for a 1" cut and notched the boards, knocked the plugs out with a hammer.
You can stack them as high or low as you want, additionally when the interior sides get wet you just flip them around, they get plenty of air just because they are fairly loose; very easy to turn the compost. I call them adult Lincoln Logs. The system allows me to make all of the compost I need, and recycled the lumber.
