Stacked Tire Worm and Potato Farm Combo
In the past I grew potatoes in a stack of small used car tires. You plant the sprouting potatoes into the bottom tire ring in a compost/soil mix. As the sprouts grow, you put tire number two on top of tire one and add more of your soil/compost mix. When the sprouts get though that layer, add the next and so on, up to five tires high. Then with the help of levers (or strong friends) you pull out the bottom tire and harvest your potatoes. The loose tire goes back on top - and so on. World without end, amen!
Why not combine this with a stacked tire worm farm, to provide the nutriment, as described in the referred article and you have a beautiful eco-system where one farm feeds the other - and you!
Here is a link that might be useful: Stacked Tire Worm Farm