That's a rather unusual way of measuring stack and reach.
It’s actually stack+ and reach+ As that’s ultimately the contact point for your hands it seemed logical somehow to use it in the drawing. But sure, it’s more of a bike fit measurement than one used for frame building.
Lucky guy! Are you going to run a 140mm stem?
It’s actually stack+ and reach+
So it is. I really do need to wear my glasses more often.
@Aderklint started
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That's a rather unusual way of measuring stack and reach.