The only real problem with the kit supplied tracks are the closed guides. With that in mind, the ones on your tank look fine, other than the already mentioned detailing (of course, you'll run into some who say they're too tight, but for a new vehicle, they're not). Glad you saw the picture of the road wheels to see what I mentioned about the contact surface.
I missed the silver on the sprocket and idler. One thing to add, that you may not have done, is that the track guides would wear at the inner surfaces of the idlers, too.
One item that's not shown in your pictures that may need a change is the wire cutters. A lot of people mistakenly paint the lower handle sections wood, or worse, metallic. These were actually made out of bakelite, and had an orangey/burnt sienna tone. Here's a picture for reference:

I mentioned paint on the taillight lens, previously, but I guess I should add the rear convoy light, too, if one's mounted.
I daresay the StuG IIIG kit you asked about builds up as easy, if not easier, than your MkIII. Referencing kit #35197, in the fighting area, the worst thing is the lack of the rear half o f the main gun. There's nothing from the pivot points back. The other thing that bugs me is the mount for the rotation pin. Without modification, I've never been able to build one where the mount was tight.

Other than those things you should have another fun build ahead of you.
What show are you planning on attending?