*Edit* How I painted these so far
I used a black undercoat although I wish I had used grey. I then used an airbrush to layer up GW Desert Yellow over the black; the thinned paint took several layers to get good coverage but it does allow for emphsis on some panels as needed. The engines and skids etc were painted with bolt gun . metal with a dash of extra black. Followed by a dark wash. I then used MIG neutral tone around all the rivets and panel joins. When dry I used charadon granite and a sponge to weather up the leading edges of the wings and areas of high wear.