Building a new bike never starts from scratch
I always start from an older bike
Measuring the old bike, and importing these dimensions into Bikecad takes a lot of time
Not in the least because angles are difficult to measure
That is why I have to measure a lot of diagonal dimensions.
Manu dimensions In Bikecad start from the saddle.
I think the saddle is not a good starting point to take measures from an older bike
The saddle is not flat, it is placed for and aft, etc
And there is always the very difficult to know Saddle reference point X and Y in Bikecad.
My life would be much easier if I could take measurements from the Saddle clamp instead.
Saddle clamp to BB X and Y are already there.
In addition I want to propose:
Saddke clamp both to top and bottom of Head tube
Saddle clamp of ground
BB both to top and bottom of Head tube
Top of Head tube off ground