In most cases all the parts are 3D printed to get real life feeling. It helps a lot to understand the shape and size. I find hard to perceive shape made with white or black filament, but grey color works.
These mounts are designed from two parts and not from one piece just to save material and manufacturing time.
Fender mounts use existing Kawasaki ZX-6R ’03-’04 fender mounting points. No customizing is required. Direct bolt on.