Cheers, guys!

The metal effect is quite easily explained: The metal was basecoated with GW Leabelcher, then given a heavy (!!!) wash with Army Painter Dark Tone (with just a tiny bit of Vallejo Smoky Ink added in for an ever so slight brownish, rusty note -- that part is optional, though). After everything was well and dry (!), I just went back in with the original Leadbelcher and added some small scratches, highligted the corners, stuff like that.
As for the wood, hmm, let me think. I guess the recipe went something like this:
1.) undercoat with GW Mournfang Brown spray
2.) basecoat with Vallejo Parasite Brown - this was key because the tone of the brown is really, really close to the wood colour used in the cardboard parts!
I also really went to town on the piece with the Parasite Brown, brushing and stippling it on with a coarse drybrush, thereby creating quite a bit of texture on the plastic. This helped later!
3.) Give the whole area a wash with Army Painter Strong Tone.
4.) Drybrush the corners with a mix of Parasite Brown and white. If you have managed to create a bit of texture during step 2.), also lightly (!!!) drybrush the surface, so it picks up just the tiniest bit of the lighter colour.
5.) Use a thinned-down lighter brown (I think I used GW Steel Legion Drab with just a tiny drop of yellow added in, but don't quote me on this) to freehand-paint on some woodgrain.
I think that's about it. Hope this helps!
