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yes you can start with ports on a head that have been digitized. Then use that digitized model as your "blueprint".
A good machinist/programmer  will go in and alter that model to make it better. Then keeps changing it as the data comes in and logs the data to what works and doesn't to better the head.
My exposure to digitized/3D scanned parts begins as a point cloud file that is then converted to surfaces. My life would be much easier if I had CNC machinists that were skilled enough to modify surface data. Guys like you are few and far between.
I just assumed that any shop that was CNC porting heads knew how to do all this stuff. Then the shops that weren't making the necessary adjustments to better their product, were in it for the quantity not the quality.
That's another reason I started this post. I wanted to be able to weed those shops out from my selection.
Greg ----------------------------------------------------------------- Cost is irrelevant, making memories is far more valuable! 
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