Hello again, Jsmyth!
One thing about "Chowhound" when I built her was this photo I found in a book. Now I located it on the net.
Looking at the vertical stabilizer and rudder, it appears to me that the whole rudder is not uniformly faded. It almost looks like a different paint was used. If you look closely, you can even see a sort of faded outline around the rudder, and the interior of the rudder looks very similar to the red paint on the vertical stabilizer. It appears that the rudder color was even painted around the hinges.
That set me to thinking that maybe "Chowhound's" whole rudder was painted red. This would not have been standard practice, but sometimes standards were not adhered to.
Anyway, I did end up painting the stabilizer and rudder red. It at least provided some interest and variation from the norm.
I'm not saying you should do the same, but I thought I'd bring this interesting photo to your attention, so you can decide for yourself how to interpret it.
It's always possible the rudder was OD and the stabilizer red; and that the OD just faded in an unusual way. Might also be a replacement, but then, how do we still account for that "halo" of lighter paint around the hinges, and the trim tab that looks to be the same shade as the darker rudder?
Research is fun!