All right, folks, a little more progress and this is where the chipping technique gets exciting. You also want to remember that you can repeat the process as many times as you want (well, I guess within reason so that you don't end up with too thick a final coat).
The other beautiful thing about this is that you CAN'T GET IT WRONG. This kind of weathering can be subtle or over the top, the choice is YOURS. And since you know Doctor Cranky is a LONG LIVE RUST kind of guy, well . . . here is the final painted body (just paint so far, no further weathering!):
But WAIT, I though you said there'd be rust . . . LOL!
After the final coat of paint is on--in this case I opted for a two tone (simple masking) job of light blue and white:
I used tweezers and something sharp to make subtle scratches on the paint . . . these will become obvious when the brush-scrubbing begins . . .