Hi,
for woodgrain effect in this model only acrylic paints were used. First I sprayed the fuselage with Tamiya XF-59 Desert Yellow. When completely dry, I used Tamiya XF-64 Red Brown, XF-57 Buff and Lifecolor Middle Stone acrylic.
The above colours were painted with "halfdry" to drybrush. I apply the paint in different directions, mosly along the fuselage. The brush is important I think. I usually use the brushes with short, "hard" hair. Something like those:
When I'm satisfied with the wood effect I spray the whole surface with Tamiya X-26 Clear Orange, the thinner the sprayed layer the lighter the colour and of course the opposite. You can vary the shade by the thickness of the paint layer.
Then Microscale glos varnish, decals, one more layer of gloss varnish, a little weathering, mostly with dry pastels and finally satin varnish.
I hope this explanation is clear enough, easier to paint than to explain

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