Easiest way to make that type material is to start with bmp pictures I'd say. It would be easy. particulary the dimples. Make a picture up and import it in the bump section of the material. From there you'll be able to adjust it's scale easily. I find that the material editor in Vue is really easy to use and I have no problem usually getting the material I need for a project. Making pure proceederal types can be tricky though so best sometimes to mix and match.