I used different tools, different approaches. I discovered some new ways for myself. But most importantly, it took very little time.I remembered how to work and combine with similar models. I used to make three different materials to get the texture I wanted. Now it's one material, one texture. I worked with two files, one for texturing, and one for displaying the texture, and the final result.
Resolution - 1024, 2048, 4096. Cards - BaseColor, IOR, Metalik, Normal, Roughness.
I don't have many ideas yet on what to do, so I've gone back to the old forgotten stuff...