Hey guys,

Thanks for the feedback.
I have attached the model. I created the top profile using the extrude & trim combo and the side was created with the sweep along two rails. Then joined them and added a 2mm radius to the top. I think the corner profiles are too complex for the shell command, I did use the loft command to create the sides but got the same results.

A bit tricky this one, for me anyway being a nurbs noob :)

Cheers
Alexander