Thanks DifferentPointofView, for some helpful input
I actuallly dabble in fiberglass bodywork, so I was thinking that if I could bend some sheetmetal to the rough contours of the car, I could build it up with fiberglass and the like to look exactly stock, then have it painted to match the car
The car is black, btw
Here's a picture:
and a rough representation of the potential fenderskirt