Hi Karl. It looks good and the drybrushing brings out the details well, but the metal look is a little overdone IMO.
I have experimented with this a good bit to get a quick finish and found the best way was to wash first, then dry brush a lighter base colour, followed by slight metal drybrushing on the highest peaks only. Then a filter, or filters, over this again makes it all look natural, but still giving good depth to the detail.
A filter or 2 at this stage, on your vehicle, will help tone this down and make the weathering more realistic.
Its only then I add some chipping. Just a thought.