Well, beside my car irl - Renault Clio 1.9RT '94 - ~1200kg / 65 bph aka ****tiest car in France after my bro's, woohoo - Renault 11 phase 1 '84 lolglycar : 1200kg / 48 bph and always out of order... Phase 2 is great with 105 bph but he have a ****** phase 1)... There's a lot of classic french car that could have been in the game :
Peugeot 403 cabriolet '59 (aka Colombo's car)
Citroen Traction Avant '34 (aka, for me, most pretty car of all times)
Citroen DS '55
Renault Espace F1 Concept '94
Porsche : well, just buy the damn licence, Polyphony. You had Ferarri...
Cadillac Limousine
Old 20' -> 50' Formule 2 cars, like the Ferrari 500 or Porsche Formule 2, with races over Monthlery classic circuit !
Trucks (hab the idea of that since GT3)
Motorbikes (hell yeah ! same, had the idea of that since GT3)
And the papamobile. NOT.
