Brother William- I just spray painted the back of a lab glass screen (the same glass evaporating dish a lot of people are using ) with stainless steel rattle can spray paint (Plastikote brand, I think) building up layers slowly, testing the light behind after every few coats until it looked right. I got it too heavy at one point and so I had to clean it off with acetone and start over. About 6 light coats, I think, is about right. This should work fine with any glass screen, like the Ford radio dial glass, also.
My faceplate was from etsy.