Abstract: The vehicle structure comprises a body defining an engine compartment and a passenger compartment communicating with each other through an opening which the body defines between them, and a panel independent of the body and arranged to close said opening between the engine compartment and passenger compartment. The panel is composed of a rigid element having a mechanical support function and a soundproofing element of cellular structure, an instrument dashboard defining internally the ducts for an aeration system, and other accessories, all directly fixed to and supported by the panel to define with it a self-supporting sub-unit. The sub-unit is preassembled off the assembly line and is then fixed to the vehicle body by inserting it from the passenger compartment side so as to position the panel in the opening, and then fixing the panel to the body.