Thank you to Stefan, Ian, Mark and Ermeio for your very kind comments.
Ian, it is very hard to tell from B&W photos what colour certain items are, to me all the struts look the same colour. CSM say that the struts are painted a light gray but a colour profile I printed out shows them as being a wood colour. The drive shaft is inside the streamlined strut so it could be either wood or metal, hard to tell from original photos. I may decide to change the colour of those two struts to gray.
Stefan, the jig is an extremely simple device, just a length of 1.0mm x 1.5mm styrene strip with 0.8mm holes drilled to slip over the pins in the ends of the struts. Dimensions for the hole locations are taken from the scale plans. Sometimes the simplest ideas work the best.

Des.