Maybe someone should come up with a "conversion standard" table for this sort of thing, ala:
CP is @ 40 inches to stool should be at 30 inches for an upright.
CP height (upright)
--|---|-----|----|----|
| 30 35 40 45
v --|---|-----|----|-----|
*
Tall 15 20 25 30
Medium 20 25 30 35
Short 25 30 35 40
* means your upper body height (spine length), and gives "fake" values for how high your stool should be. Medium would be the "My spine is normal, and my CP is at 40 inched and my stool is at 30 inches".
This is an example of what I would like to see, esp if it can be done empirically.
Short would mean you are small in stature (spine length short).