![Laughing :lol:](./images/smilies/icon_lol.gif)
http://www.aprovecho.org/lab/index.php
Here is another video showing one of the ovens in operation.
http://www.youtube.com/watch?v=_s2XZKA3R_8
I found a mechanic that had several barrels sitting out back in the weeds. Turns out he didn't really need them and offered them to me for FREE. Since the price was right I took them. My neighbor and I took his Pick Up Truck into town and picked up 4 barrels, 3 were 55 gal, one was a bit smaller.