The model principal body (2) comprises a rear boot (6) closed by an articulated lid (7) in which is retracted a unit constituted by a rear window (10) and a rigid roof element (14). The rear window is articulated (11) to the body and the roof element articulated (13) to the rear window is provided at the front with coupling means (16) to the top of the windscreen (5). Unfolding of the unit is facilitated by a leaf spring (26) placed in the boot.
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