This is extracts of an article I've found in french (Google Translator)
"This is how the Renault 58, which we lift the veil....
...There was at that time, a rumor of redemption Salmson by Renault and if this was influences?...
...In the area of the body, the overall silhouette is transformed in some futuristic. The windshield is larger and more curved panoramic...
Several points are worth noting. These include:
- the absence of any amount between the doors, although the four doors open in the right direction. This formula is unquestionably the best. Adopted by General Motors, it will impose itself everywhere. Applied to a monohull, such design poses difficult problems that the board is working to resolve.
- headlight lenses with triangular tab. This is an "innovation" aesthetic that everyone can enjoy according to his taste. We return to the technical aspects of this creation.
- the cover, which is based in the right direction, back to front (after the Dauphine, Renault can not go back); air outlets are provided to the windshield. other hand, we note the presence, next lights, air intakes used for vehicle air conditioning: the deflectors are no longer needed and the visibility is improved.
- In terms of comfort, Renault will offer 58 spacious seats (more spacious than those of the Frigate). Indeed, overall width (unchanged) the car will be better used: will he a true six seater?
Overall the vehicle should be slightly larger, much clearer than the Fregate, at the same time more nervous and more fun to drive. But the Board is well aware that such a car, whose price could hardly be less than one million, can not be manufactured at a considerable pace. We take care not to forward figures grotesque and imposing (as the rate of 300 per day for the Frigate, announced in 1950!) But Renault is its high road, so it continues in the greatest secrecy the development of this 12 HP '58, which could be presented to the next room. " The thirst for novelty and the need to feed into scoops, the avid reader of secrets, was born at times of soft fantasies in the minds of journalists ... this is not the first nor the last, the renaissance around a high-end Renault, you will see! Obviously, this car never appeared, and it is even wonder if it ever existed. We suggested, and if the engine was a twin cam influence of the other manufacturer in the Billancourt, Salmson? But look again at the general shape of the body, its chrome side in Z, the shape of the flag: it is the profile of the S sedan 2300 Motto Fair 1956! The front fenders are reminiscent of the 2300 S Charbonneaux tray. Difficult to conclude anything, but it begs many questions. This project fell quickly into oblivion, and indeed, no one spoke of it again much more. Makes you wonder if this scoop was not really made from all sides..."
Just mentioned an engineer (no named) for modify the engine. Nothing about the designer.