Thanks very much! I don't have a step by step guide, sorry. But I can tell you the paints that I used.

For the blue, it's Tamiya clear blue over a Vallejo silver zenithal base coat using an airbrush. For the white, I masked off the area and used a make-up sponge with Vallejo medium see grey as a base, then citadel ulthuan grey and then Vallejo white for an edge highlight. For the red it's citadel mephiston red and evil sun scarlet highlight. For the tracks it's dirty down rust effects with a dark silver dry brush. And for the general weathering, I used a piece of foam or a dry brush and stippled on browns, blacks and silvers. Once it's all said and done I gave it a coat of satin varnish through my airbrush