Gonna be a long shot, and tbh if this is right gonna be really surprised. If you look and the wiki a bit you can kinda notice the body of this build ( not counting the color obv.) and Excaliber Umbra Prime are closely related. Would not be suprised if you used that model as inspiration. Not exact but some feature placements kinda look similar. Its like a nod to the Umbra Prime yet still an Excailber Skin. Ethier that or I am just going crazy, which is a high chance lmao.