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Also have you expermented with diafram dia, distance from mouth and choke in air way? if you hav id love to know what you learned.i used the table saw to dato out a chanal in a oak scrap drilled my diafram hole in that glued a walnut scrap to the top (bottom), with a diafram holder made of aprocot scrap and pilot drilled i was able to use small wood screws to hold a plastic bag diafram down.
i built my first one today (and drove my wife nuts. (my 2 year old loves it)) and im now after your record is that 53in or cm, i just ask because all your dimentions are in cm or mm except the length of your big one?
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