Oh, but it is! "BUY OR ELSE!"
Some things are simply not easy to let go...
The "master" is not so perfect either... Probably just sculpeted in SolidWorks 
But even with perfect normals in boundary blends (end sections and side sections: normal to planes), you cannot get a perfectly smooth transition. This requires style to get those C2 curvatures needed for something like this...
I am happy that I -finally- got a boundary blend to work "as expected" 