I think smart kits were designed to have better, easier fit and not be a nightmare like some of the earlier Dragon releases or ones that had multiple sprues from different kits, i.e. two Sprue "A" or "B" each from a different kit.
I think it looks good. The tracks could get rusty overnight and then get shiny spots where metal ground through gravel, rinse and repeat. I tend to leave my tracks shades of brown, earth, red brown etc.