The directory structure should be something like the one below.
Mechanical/
|-- .gitignore # Ignores CAD temp files (.lock, .tmp, etc.)
|-- README.md # Documentation on how to use the library
|-- electronics/ # The "Gold Standard" re-usable parts
| |-- thing1/ # Commercial Off-The-Shelf (Vex, Rev, WCP)
| |-- thing2/ # Your team's custom re-usable designs
|-- Intake
|-- thing1
|-- thing2
|-- Turrent
|-- Climber
|-- Drivetrain
|-- Cameras
|-- Utilities
|-- Sensors
|-- Scripts