Thanks Wayne.
I must admit that, until John pointed it out, I missed the fact that the panel lines on the underside of my model are for the H-1 machine. I've already painted the RLM76 on. What to do......
As I really don't want to do yet another Green 9, I think I'll bite the bullet, rescribe the underside, and go with the more interesting White 7. The only questions now are: colour of the background in the WNr blockout (I'm guessing 83 but maybe 02), and yellow 7 vs white 7 on the rudder.