Thanks all!
Please post pics of the pre-shading, if you can, that's a technique I've never actually used, despite having read about it many times.
Hi Dutch - here's the pre-shading that i've done; for the upper sides of the flying surfaces and tail I used black mixed with a little dark earth / brown, and for the undersides of the flying surfaces, I used the dark earth / brown by itself. I left the fuselage un-shaded as this will be painted with a wood effect.


One can then use light oversprays of the top colours, such that the pre-shading shows through. This adds some depth to the finish (as seen here on my previous Albatros DV build), i.e:

I now have the underside light blue painted, and the wing camouflage (only the top surfaces of the lower wing, as the upper wing will be the mid green colour, like the tail). I've also now made a start on the plywood fuselage, using some of these trusty old favourites....

I'll post some pictures once the effect is complete. I'll probably have a forced break on this one over the next couple of weeks due to work sending me overseas. On the plus side, that will give those oils plenty of time to dry, but it's going to be a tight run to the finish line...!
Cheers!
BC