That's pretty cool. I have been thinking about fixing up a similar sort of outdoor cooking setup at my house, to keep from overheating the house in the summertime. :D

I am thinking a fire pit in the front yard, perhaps made with an old wheel rim. And then on one side I can build a small stone flue to build a small fire inside of and put pans on top of when I don't want to build a big roasting fire.

Does the lower part of yours where the saucepan is in the picture, does it get hot enough there to cook on? Or do you just use it to keep things warm and only cook on the flue top?