It would be interesting to see your spreadsheet with the calculations. I just use the segment edge length calculated by WTP.I do some processing to derive the fractional setup blocks for the distance to the blade for the Segeasy sled.
Definition in WTP help section states:I understand. So when WTP & SP state OD what is it, corner to corner or chord to chord? To allow for turn down I have added to the OD when designing.