On link below page, press ctrl+F and then search "Panel", at least one example there Subdivision Surface Modeling - polycount also check google as well if needing some more step by step for the baking process, looks like one good tutorial here: ArtStation - Understanding High Poly Floaters for Baking Details
i'm not much of a hard surface modeler, but my first hunch for the panels might be to model them and bake them as floaters. I think that would just be simpler to do rather than try to paint it in texturing. And if you bake it you can get curvature maps and so on which can give you more flexibility in texturing. you might…