Loved painting these guys. Primed pink with a zenithal white and a shadow of magenta. Covered all over in yellow artist ink. Standard GW paints for most the details, but Vallejo metal color for the metallics. Seriously, you need to switch away from GW metallics.
Afterwards, a heavy layer of Streaking Grime, an enamel wash, applied via airbrush. Let that dry for a bit then come in with a qtip with a littlw mineral spirits on the tip and remove most of the enamel wash. The result is a delightfully filthy model in way less time than actually layering tones of highlights and pinwashing and eugh.....
For the plasma glow, i based the coils in white, then airbrished some P3 Arcane something or other blue. Could just be "arcane blue". Then, a white oil wash to easily pin wash the coils so that the innermost parts liike brighter.