Oh, okay. Based it on the version in the topic's header. Anyway, I've put a new mpz and cfg in a zip right above, with some small geometry tweaks on the plane patch.
Also added some dust particles for you to review. I tuned the color, width, rate and shape. Do you think the particles fit? It's just another detail to add to the outdoor movement illusion
If you like the idea, maybe you can add some more particles and lower the fade time, so you get a better response to player movement.