Okay; 3 days and many fails... I finally got one that might pass mustard. (don't ask me who came up with that one!)
All surface boundary blends were joined using curvature.
If I had to explain the process, I couldn't. ...So I attached the file.
But it also passed the final test. It solidifies!
Creo 2.0 attached and STEP.
Set shade quality to about 10 to see get a fairly smooth surface to evaluate.