COTS: suspension, interiorLights, infotainment, displayUnit, speakers
MOTS: steeringECU, lighting, headlights
In-House: chassis, brakePedal, steeringColumn
Contract: brakingSystem, brakeECU, brakeDiscs, steeringSystem, seats

ElectricalComponents
 ├── (chassis)
 │    ├── (brakingSystem)
 │    │    └── brakeECU
 │    └── (steeringSystem)
 │         └── steeringECU
 └── (body)
      ├── lighting
      │    ├── headlights
      │    └── interiorLights
      └── infotainment
           ├── displayUnit
           └── speakers

MechanicalComponents
 ├── chassis
 │    ├── brakingSystem
 │    │    ├── brakePedal
 │    │    └── brakeDiscs
 │    ├── steeringSystem
 │    │    └── steeringColumn
 │    └── suspension
 └── (body)
      └── seats
