Just a tiny preview of the internal superstructure of my Valkyrie. If you want i can keep you posted / updated with my progress on this model? To create the oil stains I first painted black, then brown lines and then used Army Painter Shader/ dip medium and brushed it on, then wiped it off after about 3 to 5 minutes. Bewarned though Army Painter shader or dip is very sticky....I hope in the mean time you like what you see.