The Pip-Boy is a complex piece of prop replica with hundreds of components and manufacturing steps including painting, distressing and of course assembly. The production line requires 60 people in the main factory and a further 100 people in subsidiary factories who create some of the components needed for the main assembly production.
Each Pip-Boy requires over 100 minutes to be made, 36 minutes purely for assembly with highly trained line workers each assembling a specific part of the Pip-Boy. To avoid fatigue there are plenty of rest periods and periodically the line staff switch between stations so that they can maintain interest in the work. In total there are 60 separate stations in the production line.
Modern manufacturing is an amazingly logistical feat of organisation and just-in-time supply chains all working to bring a product together. There are 28 suppliers involved in the Pip-Boy manufacture. Each supplier must be checked and approved, and the components they make must meet stringent quality and performance thresholds. Incoming quality control ensures that the components supplied meet the relevant agreed standards. Of course, each supplier must also deliver the necessary components exactly when they are needed so as not to hold up the production.
All these people and organizations come together to create a gorgeous prop that looks and feels just right.