I'm building one spring of 2015. Thought I'd share the info.
http://www.traditionaloven.com/buil...-fire-clay-to-cubic-inch-cu-in-fire-clay.html
http://www.sheffield-pottery.com/SearchResults.asp?Cat=540
http://www.traditionaloven.com/buil...-fire-clay-to-cubic-inch-cu-in-fire-clay.html
http://www.sheffield-pottery.com/SearchResults.asp?Cat=540