I think I've got it licked. I found a Luftwaffe codes decal sheet that has yellow numbers outlined with black. I'd love to do N+11 in the profile above but no way to do the N, but I can do yellow 18 shown in post #37. I ordered the decals tonight so should have them by the time I need them.
Also the N+6 should be easy to get. it seems that the white code N+9 of the kit decal sheet can be used. It is enough to cut off and turn the number 9 upside down.
I added some fine mesh for the radiator since there was no molded in detail for it
The radiator finished with the intake installed along with a small intake on top. The fit of the intake lip was not great and needed some filling and smoothing out.
In this shot you can see where I had to add a shims to make the upper nose part fit.
The profile of the nose has quite a different look for a 109