Also, you said you wanted some contest at the rear where the engine grills are. Your exhaust stains are spot on!!
They look exactly like the Abrams at where i work. If you want to contrast it more, the Aussie Abrams have two of the three grills black (not sure if all Abrams are like this). The paint burns off these real fast (the heat from the rear of an Abrams is tremendous. You don't want to get to close and the smell is quite sickening. If ours go out on a publc road i do believe they attach a warning sign for the public to stay back at least 30 metres. No tailgating these baby's!!