Hi Peter! (Hi Susan, thanks for the hint!) The most simple way of building an aeolian harp I'd consider to make one from old tins. No woodworking knowledges no special tools are needed. See http://members.aol.com/woinem1/index/blechdos.htm#The

Built a harp (140cm x 40cm x 8cm) from birch-plywood (5mm) for experimenting purposes in the last weeks- and found it GOOD sounding! Used Nylon strings for generating the tones and metal ones for prolonged sounding/ mixing of tones. You can use every house/ cupboard etc. made of wood for transforming it to a good resonator. Just fix a metal thread/ string under tension to the wooden wall - and hear. Aeoliastically Uli