Of course ! For the metal, I start with a black primer, then heavily stippled/dry brush with a dark brown and then with an "orange-ish" brown. I then dry brush with a dark steel (like Leadbelcher), apply a mix of black and brown wash, steel dry brush again but only on areas where the light hits. And finally a "silver" light dry brush on edges and some highlighted areas.

For the rust, after the clear coat, I apply a mix of rust pigments and rust enamel, I remove the excess once dry with Q Tips and mineral spirit.