Yes, the car looks like a S4 but the chassis concept is rather classic with upper decks. He makes upper decks a bit narrower than B44 parts in order to have a more flexable chassis....
Martial has already planed to design a new body shell with more aggressive lines
I think it offer first of all, a way to "think different"
Thank to the benefit of a well distributed donor, the spare parts will be of course well distributed.
Martial's goal was to concentrate weight distribution around the center of the chassis, not only around the center line. It's quite well perfect indeed with 5cells