I built a bin out of re-rod wire, it was misery to bend it to shape though, and use it as a cold compost heap.
It is approx. five by three by four, plus or minus a foot, and I only empty it roughly every three to six years.
I emptied it this summer and put it on my potatoes.
The re-rod has openings of approx. four by six or three by five, I have never measured and when the compost start falling out of the sides I know it is time to use it .
I do add granules to speed up decomposition but nearly never turn it. Maybe once, or twice turn the top level at most in all those years.
It was five years this time.
I put any scraps, including food in there but most was leaves from my rose garden and lawn clippings.
I would put the leaves in there and get on top and stomp it down till it was so full the top was inches over the wire.
Now that I use my leaves as mulch I may quit using it, although I have anothe smaller, boughten one in my other garden I am still using.
When I put in in its new place I dug the earth down about four inches so the bottom was below soil level.