I agree that moving the blinkers would fall under the category of simple. A little fiddly and an afternoon of time, perhaps, but simple. Go ahead and extend that bullnose to the width of the car. You're in this deep, go for it!
And, if you score the coroplast between the flutes, about every 3 or 4 flutes apart on the backside of the curve, it will follow that curve nicer.
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-Terry
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