Here are all the gory details :
http://www.soundscapes.nu/!gallery/design/index.htm
For the shaper blades, I think it would be possible on a stationary spindle
shaper to just stack a bunch of rabetting cutters with spacers between to
get the proper shape. It would take a fair sized shaper.
A lot of food for thought in those pictures. Thanks thumbsup.
Paul P