yeah I have no idea how to fix that cover of pcg. I mean look at these wrinkles! https://drive.google.com/file/d/1TPU3V9NCWx5laSi2Aa0A6GLjWXcR4wTj/view
The metallic finish is something i cant replicate unless i use a filter or something. But for the yellowing I'll just whiten the edges , maybe with a off-white to not make it look fake.