Wow great minds think alike, i just started the forum to ask questions about doing the same thing but with a smaller mainframe just a bit shorter. I think i am going to double wall insulate it though because it gets a bit cold here in Illinois!
Ponty I don't know if you really would need to insulate it... I thought I would need to but I have been cooking in 20's-100's with great control! no insulation. But I have been thinking about putting in some fire brick, If I could find it cheap.