Sorry for the lag, but I ended up getting some games in the past 2 nights and haven't been up to finishing this guy. You can see how I ended up changing the Cygnus here.
I think I am going to put pigment on the base, but I didn't have any that was grey colored. The eyes are Fire Dragon Bright, with a spot of white for the pupil, and then glazed over with Lamentor's Yellow.
He was by far the easiest colossal that I have painted. The electrical coils are Reaper Mint Green, layered with 50/50 Mint Green and White, and then given a highlight of pure white.