Basecoat and Green
-   Black Primer  basecoat
 -   Mechanicus Standard Grey  airbrushed all over. Perhaps a slight hint of zenithal, keeping the black in the extreme recesses.
 - White zenithal.
Current iteration is   Flat White  thinned with Mr Hobby thinner, through a Badger 105 super detailed nozzle. Works perfectly once thinned properly and the nozzle is clean.
A couple of passes will be needed to hit max saturation
Mare sure to leave some pure grey otherwise the effect is lessened. -   Karandras Green  airbrushed all over
Just a hint of thinner
Try not to overdo it, there is a sweet spot where the saturation is high due to the white 
Undercoats
-   Light Sea Grey  for all light colours (whites, bone etc)
 -   Black  for darks/blacks
 -   Flat Brown  for golds and yellows
 
Gold
Leather