I have made a little bit of progress with my Landa.
I have blacked out all the metal parts and then drybrushed with Tin Bitz.
In this close-up shot you can see the detail in the sculpturing, though some of those *rivets* would be a few feet wide!
Having drybrushed with Tin Bitz, a light drybrush of Boltgun Metal to bring out the metal parts.
The next stage is to paint it in Desert Yellow.