Good question. All of the exotic veneers in this marquetry are sawn veneers (1.5mm or 1/16") from Les Fils de J George in Paris. The ebony is certifiable pre-ban Gabon cut from the log at their shop.
You have to see the saw. I shot this video when I was there.
http://youtu.be/MFGfG7B8pIk
As I consider this material to be too precious to use for anything else, the inside box veneers, the back, and the bottom are 1/16" walnut which will be ebonized as will all the solid walnut parts.

The early bird gets the worm but its the second mouse that gets the cheese.