Thanks for the compliment!
The pic of the truck was when it was not finished yet. Just the base panzer grey with a mist of lighter grey. No weathering whatsoever.
After weathering the result was like this:
I usually work over the base layer. This gives me a way of better control, specially while air brushing.
I only dry brush with metals to give it that metallic sheen, and the tarp of the truck ofcourse. But I prefer to use pencil or metallic pigments. Next to the dust pigments, etc.
And oils of course...
I will paint the Mortar itself in camouflaged Dark yellow, to give some variation. I haven't found a confirmation that the railway carriers were also repainted in 1943...
Given the field of operations for these arty pieces, I more thought of Warsaw, where it was unloaded at the Warsaw West railway station, on 17th of August 1944. Since this was in close vicinity of it's actual firing positions, it would have driven there on it's own power, instead of being broken down and transported on Cullemeyer trailers.