joint double curvature jumbo

 From:  Morten (RUMLAB)
4948.7 In reply to 4948.6 
Ahh. Brilliant! The Rhino Patch tool gives some pretty irregular results,
but it does extend the surfaces and trim them, as your principle,
which could have been a hint.

The mirrored matching was only in desperation, but I didn't see any non-planer curves?

Thank you again.