Having worked a lot of my Grey Knights Land Speeder, one of the key components is the replacement crew. I could have used the included plastic Space Marine crew, but in the end I used some metal Grey Knights models. I started with a black basecoat and then gave the armour a basecoat of Boltgun Metal. This was followed with the gold metal parts been given a base coat of Brazen Brass.
I then started painting the base coats for the purity seals and other iconology on the Grey Knights.
See the full workbench feature.