Wow Wendax, that's quite a find! Very well done, especially after so long. It's interesting to see that the car is registered in the French departement 24 (Dordogne), which is some distance from where the first photos were taken, at a classic car meeting near Lille (59).
I suspected that this mystery machine would be Renault 8-based, so it's good to confirm that it is. I will add a point to your tally for this great find, but I will keep the Puzzle open as we still don't know who built this car, or if it has a name. So, if anyone can add any additional information, more points await...