The phrase "body shell" refers to the outer or main structure of something, like a vehicle. It acts as a protective covering that encloses and supports the components inside, such as the engine and seats. Full definition
The outfit features a compact body shell with neat lines across its profile. (rediff.com)
It has a specifically designed aluminum body shell, which is built on an intelligent lightweight construction technology. (cardekho.com)
It also features a strengthened steel body shell and a lightweight interior consisting of several carbon - fiber parts that reduce the car's overall weight. (topspeed.com)