Okay guys here is some more pics for those of you who asked... The first is a picture of the mouth piece.. The hole is 3/8" long by 3/16" inch wide... The far edge of the hole, (the one the air hits) has a slight angle to it, to make a sharper edge for the air to hit... By playing with this angle the tone can be improved. I made the holes with a small dremel grinder... My origional intent was to sand out the holes with this, but at 20,000 rpms, the dremel burnt smoothly through the bamboo, making a clean hole that is 3/16 inch in diameter for the finger holes... These are placed 3/4 of an inch apart on mine and the lowest one is about 1.5" from the bottom of the flute. The next picture is from the end of the flute that you blow into showing the node left in. This creates the closed end of the flute. The following picture is the other end, showing the opening that the air escapes. The last two pictures are for scale... Hope this answers some of your questions.
Jon
I also have a number of flute "blanks" that I cut out this morning so if anyone is interested I could make you one and we can work on a trade.