greenhouse construction + rocket mass heater how to tutorial

Greenhouse construction with a rocket mas heater, including an excellent demonstration of the rocket mass heater sideways burn. The greenhouse construction class is taught by Ernie and Erica Wisner, featuring the rocket mass heater techniques of Ianto Evans (of cob cottage company fame). I cannot think of a better approach to greenhouse heating. This is the first phase of building this greenhouse. The focus is on the steps of building the ro