I haven't had the time lately to mess with it more... But a couple more have been made. The new ones are a smaller plate size and screws that are a bit easier to use.... I had some issues with the screw threads we cut so I need to try again.
As for doing something commercially with it... I'm considering it, but once again the time thing... Not completely sure of what direction to go.
the site is:
http://photos.yahoo.com/fifthcircle2004 (then click on mic hanger)
--Ben