Thank you all for the kind comments. I’ve added some more dirt on the tracks and this was the very final step of the weathering.
I call this one done. The full build article is available at my site.
Nailed the camo! I hate to open this can of worms, but here goes: “Scale effect” could easily apply to the sand and black demarcation on these four color schemes. My thinking is that even though all the added colors were sprayed and probably not freehand, in 1/35 scale that very slightly feathered edge would be all but undetectable.