I've got a little project on the go where I'm trying to convert an old electric kiln into a down draft gas kiln. I'm at the point where I need to construct a chimney and I've done loads of research on designs for this. The easiest and most obvious solution is to build an external chimney out of brick. But I'm doing this on an extremely limited budget so buying enough brick to make a safe chimney is out of my reach at the moment. I do happen to have access to a load of Crank stoneware clay. So I was thinking I could either throw a chimney in sections or handbuild one out of slabs. Now here's the nub of the question. Should I build the chimney in situ with geenware components and fire the kiln to finish it off? Or as I also have access to a barrel and a load of sawdust and offcuts, should I pitfire the components and then build the stack from there?
Any thoughts, advice, horror stories would be greatly appreciated