Hi Steve, There are two books that will give you lots of information
on singing bird boxes, including those by Rochat. These are: "Singing
Bird Tabatieres", by Geoffrey Mason, and "Flights of Fancy", by Sharon
and Christian Bailey, which includes a CD ROM.
The Mason book can be difficult to find but we currently have both
books in stock at our central London shop, and also the classic
automata texts which have chapters dedicated to singing birds.
London 07790 71 90 97