This morning at 5am

Up till now I have pretty much ignored all talks about biochar kilns but having read a few blogs and sites on the additional benefits (other than producing biochar) I have changed my mind.
Kilns are great, especially the simple and effective ones. My eyes set on the Anila kiln (remember to add ref.) which is easy and cheap to produce.
Another thing that popped into my mind this morning was clay. Why not use clay to build a biochar kiln? I will get back to you as soon as I have more references (if there are any).