[www.hallofmaat.com] covers Gardners angle on the Nebiu with his sources attached.

Stecchini museum sample rod is actually 7 hands as opposed to 7 palms.
7 palms being 20.625
7 hands being 20.625 * 4/3

You can equate this rod to 37.333 fingers
or simply 28 thumbs

You can equate the hand to 5.333 fingers
or simply 4 thumbs

You can equate the half hand to 2.666 fingers
or simply 2 thumbs

I am not focusing specifically on the Nebiu although any illumination would be interesting. More on the comment concerning the carrying yoke and it being related to length.