I have now completed modeling the upper front of the Salcombe. Also put a mix of final and temporary textures to get an idea how how it'll look. Nacelles are temporary (but accurate) by Alexander Klemm.
I actually did a ton of experimenting to get the correct pearlescent look on real life miniatures, as well as CG shaders. The paints used on the original studio model are known as "interference paints." When a specular highlight is not hitting them, they have one color, vs the compliment color when they are being hit with a highlight. I bought some of these real paints and airbrushed them onto a spare model piece to test them.
Note, I sprayed them VERY heavy so that I could get a good look at them, and you'd not want them this opaque on the Enterprise.
I made this quick reference chart for how to set your shader colors in CG. (sRGB, you'd need to linearlize them for a linear scene)
I WILL go back to finish up the Salcombe soon, but I wanted a "simple" project to work on for the week. I almost bit off more than I could chew with the Salcombe, as my modeling skills are still beginnerish.
This is two evenings work. I'm going for Smithsonian accuracy for this.