Charles N.;
Good-looking JT! Lots of great stuff going on here - way to GO (Geaux, down here in Cajun-land

)!
I'm glad to see there's another guy out there who likes the pastel chalks and turps route for rusting and staining! Of course, chalks are "wunderbar" for doing dust and dirt, too!
Other folks have hit on several minor "dings" - MG drill-out, "bakelite" (Tuffnel - a German version made with impregnating cardboard with resin to create a non-conductive insulating tool-handle) in a red-orange color, thinning some fender/cover edges, etc.
The teeth on your sprockets really want to be scraped/polished metal (you may well have done this, but it does not show in the pics...) and that similar metal-on-metal polishing on the inner surfaces and teeth on the tracks as well. This is EASY to fix up on any kit! Grab your fav sharpened #2 pencil and apply a little graphite to get a nice rubbed steel surface!

Great for hi-lighting - even after the fact - any rubbed "metal" edge or surface. And because you are applying some finely - polishing matter, it will smooth a surface realistically!
I liked the tools in general - nicely-done! There is one glaring "not": the cleaning - rods were wood with metal ends which screwed together - these are molded onto the bits. The wood shafts could of course be painted or varnished, the metal bits "aluminum", "steel", or painted.
Overall, very cool and impressive! I need to pull one of these down and build it! Thanks for sharing this monster!
Bob