Tug,
I agree with your conclusion, but wanted to seek a bit of outside expertise since TVAL and Wingnuts seem rarely, if at all, to differ in their representations. Included in the Datafile "RAF FE2b at War" is reference to RAF Secret Operations Order #34 which apparently doesn't include information on the booms. It does refer to a mostly black over paint however it also says the nacelle is to be painted dark grey which Wingnuts and TVAL have not done on "Jess". Wingnuts scheme "D" and the profile of B1877 in the Datafile show the metal portion of the aft nacelle in dark grey however.
I'm guessing it's like the "real" colour of PC10, the only thing we can be sure of..................is were not sure! I appreciate your info, I'll probably go with the painted booms unless someone comes up with more information.
Cheers,
Lance