Minigama firing

A handful of people have started a Yahoo group for anyone interested in the building and/or firing of a minigama. This video is from a member across the pond from me, he posted a short utube video of his minigama spouting flames. His is so nicely constructed...I won't whine about mine drying 3/4 of the way through completion anymore, BUT it wouldn't have been as nice anyway.
OK, my goal is to finish what I can on my mini and get it bisque fired next Wednesday, July 9th. I still need to get a flue...I was reading "The Potters Handbook", I think it was published about 1934. It's by Bernard Leach and he said that the flue needs to be a certain length longer than the body of the kiln or something. Note to self: get that book again and stop quoting stuff all wrong!