As a mechanical engineer, I've been fascinated by the idea of building a music box from scratch. After doing some research, I found out that it is indeed possible for mechanical engineers to create these intricate and nostalgic devices. The process involves designing the mechanical components, selecting the musical mechanism, and crafting the box itself. The key to building a successful music box is understanding the mechanism behind the music, which is based on the rotation of a cylinder with pins that pluck tuned metal teeth. With the right skills and dedication, a mechanical engineer can not only build a music box from scratch, but also customize it to play a unique tune.