Hello -we want to start making compost at the home of my parents in law. They started growing some plants in big pots last year (tomatoes and green leaf things) - they enjoyed this and did get some produce but were not overly productive because of poor soil and they really need a compost supply. They use cow dung mixed with the soil but in my experience things grow much better with compost as well. They dont have a lot of space do a messy compost heap is not a good option. We were wondering what is the best way to make a suitable compost bin - what material (wood or metal), how to make it, how much aeration it need etc. We do not have access to any ready made models that we could buy, neither do we have any place to buy compost worms. Thanks!