It was artistically inspired by the Legion of the Lunar Wolves. I based this on 10th Company Captain Garviel Loken.
The design is directly from the cover of Horus Rising, so I am as lore accurate as I can be, minus a brand of a moon on the helmet. There are many other versions of the MK 4 plate, and I may model some of the in time.
This helmet is large enough for an Astartes. So, it will be a big thing to print. It might take two rolls or more of filament.