Okay, here are photos of the finished Yak. To begin, I highly recommend building this little Accurate Miniatures kit if you find one. It's a great build, though the windscreen is somewhat wider than it should be.
Accurate Miniatures Yak 1
Accurate Miniatures Yak 1
Accurate Miniatures Yak 1
Accurate Miniatures Yak 1
Accurate Miniatures Yak 1
And one photo with my old LaGG that was airbrushed in a temporary winter scheme, just to contrast the two methods:
Accurate Miniatures Yak 1
I promise to add more to this on how I used the Ultimate Weathering Wash, but first I'll build up a sample so I can take proper photos.......