Here's the one I built back around 1990:
http://www.io.com/~trag/Chimney/Chimney0.JPG
http://www.io.com/~trag/Chimney/Chimney1.JPG
http://www.io.com/~trag/Chimney/Chimney2.JPG
http://www.io.com/~trag/Chimney/Chimney3.JPG
It'snot the professionally die cut one, but it worked for several years.