Specs on a body kit? Create a 3d grid of them. In other words, put the fender a certain distance from the wall. Then, measure things like, "6 inches from the front seam, 12 inches from the ground, the fender is 15.5 inches from the wall; move 6 inches to the rear (still 12 inches from ground), the fender is 14.75 inches from the wall."
I used this method back in college when I had a friend measure the chord of a Cessna wing for an aerodynamic engineering project. Of course, he was measuring relative to the ground, but the principle is the same. It's not the most accurate thing, but it gets you well into the ballpark. Or, I'd hope it would for someone who does this stuff - perhaps not . . . laying fiberglass and forming body panels is a black art to me.
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