Chad, I would not worry too much about the colour as it is an ever-changing and elusive thing to get it to match anything even when you have the real colour chip in your hand and a container of the actual paint. Weathering from the wind, sand storms, rain, and even the wash rack will take their toll on the finish so no need to fret over it. I like how it looks and it is not very often you get to see a British Sherman sporting the bulls-eye on the turret roof. I wonder how many of the real tankers thought of it in that fashion and did what they could to obscure it from observation just to lessen their chances of being detected from the air.