The only modification is the paint on the mask, everything else are normal Lego parts.
I used the transparent red pieces in his torso, because hints of it are visible in the concept art.
This moc surely could still be improved but I don´t have the pieces I would need for that.
This looks ok. Could be much better. I think the reason most of the cooler concept art was cut, was because it didn’t directly translate well into ccbs.
And the legs… ok… what happened. The pieces for the upper legs are clearly the normal or a modified to be shorter thigh armor piece commonly found on the Star Wars constraction builds. And the lower legs… probably the same piece used on Kylo Ren’s lower legs.
Edit: ohhh the updated version is much better, but he needs longer upper legs