Presentation of the "overall diagnostic study" relating to Chaslerie. This imposing document of more than 300 pages in A3 format contains very precise statements of great intelligibility illustrating the evolution of the monument over the centuries. By the heritage architect and project manager, Mr. Arnaud PAQUIN, in the presence of the project owners. This study sheds light on important pages linking the History of France to that of the Domfrontais, a territory with known and legitimately promoted medieval roots, at least in principle. Thus was discovered at the Chaslerie and interpreted by Mr. PAQUIN a "shooting bench wall" of a hundred meters long, particularly original and rare, which vividly testifies to the concerns and events of the period of the regency of Marie de Medici. The study is underpinned by an architectural project aimed at continuing and developing the organization at La Chaslerie of master classes for classical or baroque singers. The financing of this project will also be discussed.