Matt N.;
NICE E! It's coming along quite well, and is certainly going to look the part.
I do have a comment or 2 and a question...
1) I would strongly second, third, or nth the bit on dunkelgrau underneath for these earlier DAK panzers - that said, of course I wouldn't do a repaint, either! Touching in on your chips with some d-g would work wonders, and yes, I agree that there would be some that chip thru to the primer red beneath. But these would likely have a d-g ring, or so I would expect? Looks like you hit some with the d-g, and I'd encourage as many more as you can take!
2) About the Pz IV tracks... best of my knowledge, most or all were made of some alloy, not straight cast-iron nor straight cast-steel? Also, at the factory, they apparently were often primered (red) and then enameled black - or so many have asserted. Personally, I start with deep rusty brown or sometimes black followed by dark brown washes - but generally all of mine end up heavily dusted and dirt-stained (flat earth) followed by lighter pigment (OK, chalk) and lastly some pencil "lead" on the bearing / friction surfaces. Unless a track was washed or run thru a lot of water, it would generally never look like a newer black one, I don't think! I'll of course be watching for how you address this issue - I know it will look good!
And a question: I see that those flaps are raised over the air inlets... why? Almost only ever seen in winter in colder places, like Russia. And even in winter, only some would be raised in almost every case- very seldom have I seen any pics of IV with all raised! Is this somehow supposed to be a cold tank? Just asking!
Keep on tanking!
Bob