Carol:  I have heard such an instrument played by one of the leading
practitioners of the Glass Armonica, Dean Shostak.  He performs at
Colonial Williamsburg VA.  As I recall, he has had at least two of
them made (they are quite expensive) so he should be able to help you.
I have a CD recording of his work and there is an address on the
liner notes where you can contact him:

  Dean Shostak Music
  PO Box 465
  Williamsburg, VA  23187
  Tel. (804) 642-1356

Musically yours,

Bill Wineburgh