Where can you find blueprints for a bandoneon?

Blueprints for a bandoneon can often be found in specialized music instrument design books, online forums dedicated to Accordion and bandoneon enthusiasts, or websites that focus on instrument making. Additionally, academic resources or libraries with a focus on musicology may have detailed schematics. Some luthiers or craftsmen who specialize in traditional instruments might also share their designs or offer guidance on building one. Online platforms like Etsy or specialized instrument-making communities may also have resources or links to blueprints.