John. I have revised the bow as of this year with a shorter riser. This allows me more flexability in bow length. I can now build the bow down to 58 inches . Shortest I have built though and I use it for elk hunting and pull it 28 inches with no stack. So I can build this bow for just about any bow length from 58 to 68 inches. For anything over 30 inches I do recommend the 68 inch bow though because even with all my tweaking it still has some limitations inherent to a D bow.
All bowyers I know measure from the back of the bow at the sight window and 90 degrees to the arrow nock. Brace height is measured from the deepest part of grip and 90 degrees to the string.
Generally the depth of the grip is 1 and 3/4 inch from deepest part to back. This can vary with straight grips and the grip may be rounder and depth more like 1 1/2 inch/ But still , brace is from deepest part of grip to the string and draw length is from string to back of sight window which is the furthest part of the bow from the string. In this case the back is the front haha. Talk about confusing!!!
God bless, Steve