Thanks guys

Took the weekend to build some terrain with my son. Here is what came of it (please bear with the loading time, my site seems to be rather sluggish at the moment (again

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Started on a third building, too. I used some insulation material called "Selitron" instead of MDF as interior structure, which so far I quite like.
Hitman, I used mainly four colours for the doors, Vallejo Model Color Stonewall Grey as base colour, drybrushed with VMC Pale Sand, washed very thinly with black. For the rust I use Parasite Brown, blended into the base color. Try to use vertical brush strokes to simulate the rust washing down. Last come dents and scratches, using two shades of red-brown. I painted two thin lines, the upper one in the darker shade, the lower one much lighter. That's basically it.