On page 101 of my book Pagoda Style, I selected a number of style exercises on the W113 from 1959 through 1963. I'm certain this was not ALL of them, but just a select number provided by Paul Bracq. In almost all cases the front of the car, and the front windscreen was essentially unchanged. All the styling exercises were done with the hard top, and its rear window, it's quarter window, and some slight variations to the slope of the boot/trunk deck.
This custom one off could be a Photoshop job; I've seen some excellent graphic renderings done in excruciatingly high resolution that were nothing more than graphic fabrications. This image presented is kind of grainy and low resolution so might be a "deep fake". More likely it's a custom job.
The rear wings are almost Ponton like, and the rear window is a wrap around. The B pillar is almost nonexistent.
Kind of an interesting treatment...