Above is the form for the rocket stove, it is made from a garbage can.
The concrete cured and when dear hubby took the form off some of the face was missing, so he added to the face by free sculpting with concrete and again letting to dry. There are a few hairline cracks on top where the new concrete was added.
And now for a test fire.
Yay, it works so far! Hubby wants to use this tiki rocket stove to heat the greenhouse he is building.