Looks good David. I like coatings too, and think it's a good idea to do the exterior of the intake and the exterior of the fuel rails. The coatings are available in a variety of colors and some look nearly like fresh cast aluminum, so they're attractive, shield the intake from heat a bit, and protect the bare surface from corrosion.
Just as we try to keep the heat "in" the exhaust system, we should be looking for ways of keeping it "out" of the intake system.