Erich, somewhere there was a SEOS-30 mentioned as a possibilty. I remember seeing the picture and it looks beautiful to me. I am looking at crossing a B&C DCM-50 in the 450Hz area and would like to use a large CD waveguide. Jacek mentioned on DIY Audio that the DIY Soundgroup forum would be the place to guage interest. Not sure how many pieces we would need pre-ordered to get them built but I am definitely interested. Any possibility of these being built ? Thanks for all your hard work. Daniel.