That’s at least still Elementally coloured. I should specify non-Elemental/generic metallics; I prefer Toa to be as colourful as possible, not hiding colour underneath colourless metal. (Yeah, I know there are some Elements whose colours schemes are generic colours; this isn’t about them)
After the Helryx MOC Contest, there was an Art Contest in which artists were instructed to replicate the winning MOC in their own stylization except for the mask, which they were to replace with a custom mask which would become canon.
I suspect that the Art Contest would have happened anyways even if BS01 was cool with 3d printed parts, since a fully canon MOC would have required a custom mask, which TTV has said they would never make mandatory.
The only difference would be that the MOC would also be official.
EDIT: I’m just going to bring this discussion over here:
I’m not sure, but I was under the impression that the Hagah had removed and replaced their natural armour with the metallic armour, not simply put it over top.