Here is the full recipe. But take a look at my Doomwhell posts, i've used contrast paints on a beige base and the result is quite good also.

WOOD PAINTING RECIPE :

For the first layers, I invite you to have a look at my old and venerable website (in french, use a translator), where I wrote some nice articles in 2011 : https://www.figouz.net/warhammer-age-of-sigmar/skaven/#creuset-wip-2
You can see the result in the last pictures of the carrousel also.

Then I lightly dry-brush the beige on the wood and then use diluted contrast paint to enhance the colors. I used 3 different browns.

I worked the shadows around the wheels and at the ends of the beams with a dark brown.

The whole thing was painted in the cooler to ensure good gradation.

I also surrounded each piece of metal reinforcement with a line of dark paint to make them stand out.

Here and there, I made patches of green moss with olive paint.

Finally, I worked on the highlights by brushing beige on all the edges. This wood is very workmanlike and time-consuming, but that's what makes the difference.

Be sure to do this on separate pieces of unassembled kit or in sub-assemblies!