Hi Franz.

@You : "...I also tried the procedure with SubD. Unfortunately, however, I always came up with an uncontrollable result...."

Hmm....this sounds a bit strange...
The good thing about SubD is that you can always leverage on supporting edges placed near of far the main edge loops to control the sharpness of the curvature.

But this is much easier if you do SubD things using a "true" SubD modeler. Moi + Max's SubDiv plugin is great but has a lot of limitation because Moi is Nurbs, SubDiv not :)

Of course it's not the same thing like dealing with true Class-A surface tools but...


Ciao!