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Sail Measurement

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Thought I'd have a go at sailmaking but I'm a bit confused by a couple of points in the rules.

1) Width Measurement. The sail measurement diagrams show that the 'widths' are measured  between the 1/4, 1/2 & 3/4 points on the leech and the nearest point on the luff.  Simple enough but how do you find the 1/4, 1/2 & 3/4 points on the leech?  Since the leech has a significant curve, do you have to measure round this curve, as that is a difficult to do in advance.

2) Leech Radius.  The wording of J.6 is confusing to me.  I think it's saying that you can have angles (or radii less than 900mm) in the leech, as long as they occur at either the leech points or at batten points.  Or put anther way, one could have a sail with the 1/4, 1/2, 3/4 widths all the same.  The sail would effectively be a quadrilateral with a right angled triangle on top.  Obviously not a great idea but there is clearly a temptation to increase the width of the upper part of the sail for light airs.

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