Hi LM, I found a colour drawing online. It's from Windsock Worldwide, Vol.28 No.2 and it shows a Westland-built Vimy in NIVO. But as I'm doing mine as F9569, in PC10 and grey (shown in the same publication), it's not really much help.
I've painted them as wood for now because in the book that I showed earlier there is a photo of F9569 and although it is in black and white, the engine struts all appear to be the same shade, even if they aren't the same colour. Perhaps they should be grey?

The cabane struts provided were too short, especially the rear ones since the fuselage hump has been removed, so I used aluminium tube to make new struts. I squashed it flat and filed it as required.
All the rigging is done and it's down to adding the smaller details.