Mr. Lawson, you are indeed a task master, now I know how Igor feels!

I think a demo would be the best way to describe the method. When I complete one of the remaining D III's I'll take pics of the process and post them. I'll write a brief explanation for now.
Using oil based enamels, I paint the natural fuselage using Humbrol #63 which is a warm honey brown. I let this cure for 24 hours. I then mix Humbrol #74 which is a yellowish Ivory with the #63 color in a ratio of 75/25, darker to lighter color. I then use a #00 brush to freehand the wood grain pattern on the panels, trying to alternate the pattern on the panels as I go.
After this is dry for a few hours I mix up another batch of the colors mentioned above but only this time a little lighter, say 60/40 dark to light. This is used to highlight the second color. I will use it in the middle and along the contours of the second color.
Once the third treatment has dried for a few hours I then mix up a new variation using #63 as the base and add #73 which is like a reddish burnt sienna color in a mixture of about 85/15. The #73 is pretty dominant so I take it easy on how much is used. Then I take out the dreaded #0000 brush and add contour lines between the base color and the larger wood grain areas as well as some grain lines within the base color itself.
The final step is to use the last mixture to add the panel lines. If they come out as too dark then I wait another 48 hours and give a light wash of the base color over the panel lines to tone them down. Ease does it on the last step because too much thinner can mix the whole lot if not let to dry for a nice spell.
I try to keep the variation in tone from the base color to a minimum to reflect the subtle differences found in sheet plywood. This method is constantly evolving so feel free to try it and change it around to make it your own.
Regards, Dwayne
P.S. How come Ursula never has to do any of this stuff?????????