Abstract: This dashboard comprises, inter alia, on the one hand, a rigid, self-supporting and permanent framework (10) with a box-section member, a virtually flat panel with a perimeter whose size is adapted to that of an opening in a partition wall (C.sub.1) of the structure so as to close it and be held therein by fixing zones, at least one support and at least one cavity and, on the other hand, a removably attached rigid cover (20) which fixes approximately the exterior shape of the dashboard and, finally, a removably attached lining (30) which matches this cover (20) and defines the appearance of the dashboard.