Thanks!
Do you have thrift/charity/resale shops in Sweden? That's where I find nearly all my terrain asside from some of the kits (Dust and Mantic). Broken toys or those missing pieces usually go for pennies on the dollar and can be an excellent starting point for terrain.
As for the paint, I love your description, but can't claim that I intentionally did it. The fast washes and drybrushes do result in a certain warmth though. One neat thing I stumbled across the Elevator section and the legs of the tank are ruddy brown primer with aluminum drybrushed and tan drybrushed across that. It's a fast way to get a finish that's not overly rusty in a literal sense (no orange for example), but still suggestive of wear and corrosion.