My life remains in disarray, but, when next I can apply myself to my box of excess deck pieces, I've set an experiment to try.
This would be a gull grey base, followed by a heavy radome tan semi-transparent wash. This would then be sanded to some degree. Then probably highlighting/shading in "wood" colors, followed with a burnt sienna wash.
Ive tired the other way, using mixes of DAK Sand, Khaki Drab, and Panzer Tan--all cut 50% white. Then, overlaying a haze grey wash. This is a good effect, but, it still "scans" to my eye as a "paint effect" not a replication of natural effect.