There are two real-world parallels we can draw here. One is the Liberty Walk Silhouette line of body kits. Inspired by an old Japanese race car series, they offer streamlined, simple fender flares that take supercars to the next level. There is one for the GT-R, of course, but it isn't nearly as good.
No, we find that Hycade's work always looks like a cross between Khyzyl Saleem's old style of neon-colored cyberpunk 2D art and Audi's design language. The GT-R's big fenders aren't like a body kit; they're designed the same way as the RS6.
At the front, the 3D model is trying to put on its best supercar impersonation with a hood that channels air like a race car and large vents to cool the brakes. The side skirts and rear diffuser are aligned with how Nismo does things but a bit larger. Meanwhile, the rear might be inspired by BMW.
See the way the shoulders are massively wide and rise into the tall wing? Well, that's what the 3.0 CSL Hommage R was like. Also, the overall proportions are similar to the stubby M2. The German connection is why we dubbed this the GT-R "Competition." After all, every superhero needs a cool name.