OK..... the "sill" is the "rocker" panel and follows the assembly weld or the "pinch weld" you mention. The pinch weld runs parallel to the flat surface on the "sill/rocker"bottom and an easy place to put a digital ° gauge. Actually, I don't really care if it is exact or not and was just checking out of interest to see how much nose down my car has. My "floor" is my 4 point lift with the thing fairly level at least by checking with a long bubble gauge. The nose down attitude is due (on my car at least) to the difference in diameter of the "huge" rear tires and smaller front tires. I have no idea if the pinch weld is parallel to the roll center line. I was only concerned visually in relation to the ground.
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