Update is here: https://youtu.be/O-qyqkq-fY4
Hight: same, or subtract 1 or 2 mm from your (A) measurement - distance between 1st & 2nd groove of your thumb.
Wall thickness: 4, 5, 6 mm 4 is at really thin side. 6 feels bulky. It is related to your string width. Modern bow string is very thin comparing to historical bow strings.
Inner diameters: worked best for me is that it is not loose, it doesn't slip off easily, yet you need to be able to wear it for a long time without discomfort.
Round end: Smooth rounded edge for the root of your thumb.
Bow end: (! 20-30 degree steep, 45 degrees is not right) I need to make an update video!
I like oval shaped hole. (My finger is flat. It's easier to put on.)