Painted 3D terrain guide?

By FrogTrigger, in Imperial Assault Painting and Modification

Anyone care to share their strategy for painting the 3D terrain? I mostly mean the terminals/crates/door frames that are floating around, but any and all terrain strats are welcome.

I was thinking of just a grey prime, nuln oil for definition then some sort of grey dry brush and then some color for any digital lights. Obviously very vague which is why I am asking for specifics :)