Restoring a Boulle case is a tough and tricky work. One of my friends tried it, we had to replace some of the missing brass inlay, it's easy to create but since it's thermal expansion differs from wood's the glue will let it get off from the surface. We used gelatin glue to stick and to cover the inlay.
As it was finished we moved the clock up to the living room from the shop and after few days I saw some cracks on the surface.
Maybe he used too thick brass plate.
Anyway the finished clock looks fabulous.