These guys like concrete more than Kiko Denzer does.
But included is a recipe for--possibly inexpensive--refractory cement that I probably will be in need of rather shortly. And there's a forum.
and, a (tongue-in-cheek I hope) tutorial on how to clean out an oven. With pictures!
And we've got significant rain for the first time in weeks if not all month--3d driest May on record in Nashville, and I suspect that they had more rain that I've had. My plants will be happy. I'm glad not to be toting water up from the stream for them!
http://www.traditionaloven.com/