I wanted to make it in a towed position, with opened platforms. One should consider also leaving wheels unglued.
In the next steps I'll add some dust and more dust, but before that I'll have to think about some filters application.
After that step very diluted brown wash with hexane/turpuntine was added. The oil paint was first put on the tissue in order to drag out the oily residue, then it was transfered to small cap and diluted with hexane/turpuntine.
Shortly after small bare metal chips (made with panzergrau/black and some clear for satin) were added (again with sponge):