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cowl, and roof, and under the rear window, to provide form and attachment points for a sheetmetal skin, typically aluminum for weight-savings, as rigidity is not a consideration.

Unibody

The terms "unibody" and "unit-body" are short for "unitized body", "unitary construction", or alternatively (fully) integrated body and frame/chassis. It is defined as:

Vehicle structure has shifted from the traditional body-on-frame architecture to the lighter unitized/integrated body structure

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