Hi danny thanks for the reply. Right that seems to work in a round about kind of way. But then when I join the 2 shells together there are faults with it?
I've included 2 files. One with the 2 shells which I'd be interested in knowing how you'd snap together as well because both are shells. Rather than the shell you aligned with the curve 'cage'.


The other is the shell created using the technic you say Danny but there are faults with it when I joined them. That means that when I come to choose say fillet it for instance it doesn't work?