A complete kit was available for boot-lid mounting, including underside reinforcing frame/studs, counterbalancing spring, wheel spacer, and vinyl cover (choice of black or brown, iirc).

Looked particularly lithe from the side. The black sills on later models (there I go again) helped, as did the stainless side trim. The two bumps on the later (sorry again) bonnets were nothing to do with the V8 covers, but were put there by David Bache to improve the look and strength the aluminium bonnet. The TC and the V8 got them at first, and then the 2000 and 2200 too. That lovely colour is Almond.
The closer you look, the more Citroen DS influence you can see. Solihull had several DS's meticulously stripped down.