Thanks so much everyone - this has been a few months in the making, but I'm very happy with how it came out. The biggest wait was for the display box - I had asked a local glass shop (who happened to be a friend of mine!) to craft some glass for the window, and he offered to craft the box and paint it black, as well as put it together for me. He had also added a blue tint to the textured back piece of glass. It was his first time making something like this, but I think the box turned out great.
The vines and wing were both crafted with copper wire I had found at a dollar store, and some air drying clay. Hot glue was my best friend in this project. I ordered various feathers off Amazon (hard to tell by the pics but yes they're 'real' feathers!) and painted the wing 'armor' and put it together. I attached materia to the vines, as in the original display, it appeared to have orbs of material scattered around. I had to sacrifice the materia from Remake Cloud ...
As for the figure himself, as you know it's GT Sephiroth's extra head, paired on a Jiaou Doll JOK-12D-YS body (with minor body blushing) - which the skintone matched perfectly. The physique is pretty on point too. Not bad for a
Jiaou Doll... Aside from that, I added gold paint to the inside of the glass to resemble 'God-like' rays as in the original. The light coming through in the pictures is because he's displayed on my computer desk, right in front of a LED strip that runs down my wall/across my desk, so the coolest part - I can change the color of the illuminated background in just the press of a button!
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Thanks everyone! Happy to share this here.