You know, looking at the second picture I just now noticed that the plane must have originally been painted in prototype orange. I always thought it was rust, knowing that late in the war the Japanese sometimes substituted steel for aluminum. But like I say, now I see that the undersides of the wings are orange, as per a prototype, which was only later painted green. Maybe it was going to get ready for a mission or just to keep it camouflaged from air attack? A wealth of information if you take the time to look.