Eventhough I'm still not sure about the final paint scheme, I decided to use Astonomican Grey as base color - this area is more or less interior, so it won't interfere too much with the final outer paint scheme.
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To emphasize the steampunk topic even more, I decided to give some of the pieces a wooden surface.
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Together with the brass, I think this looks pretty steampunk, doesn't it?
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For the other pieces I kept the paint pattern of black base coat, drybrushed with Boltgun and some items painted in Tin Biz and Dwarf Bronze.