shell question

 From:  renklint
1411.1 
Hi, would like to shell this twisted model and then connect it with other pieces.



As you can see, there is a lot of twisting in the edges because of the bent shapes.


If you shell a quarter of a sphere you get sharp edges. This is what I'd like to achieve.


One idea was to join 4 pieces of my model, shell it and then use Boolean|Diff to cut it into 4 again. But because of the way it looks this is not possible to shell.



Anyone have any idea? Maybe I should try to enlarge my model a bit all around, shell it, and then cut of the "waist".

/Lars