I saw this design for a rocketstove on youtube. It was easy to build and works well. I use various sizes of sticks to make the flame easier to maintain.
I am planning to remove a lair and installing a thick metal plate for a thermal regulating top.
I cooked chicken for two days and on day two tested my mettle in the rain. The rain made my griddle stick free and provided a steamy heat transfer for me to steem share. I don't have photos of the steemy steaming chicken but it still tasted great.