Hi Michael,

Thank you for your reply. I have more question I'm afraid. Please bear with me.



I managed to untrim the curved surface (c) and I copied out the profile curves (d) + (e). 

I aligned them and joined them using join, (tried exporting using SAT but I’m not understanding what step) and then I extruded it (f).
Could you explain the step involving the SAT in detail please?

I’m guessing i need to make a curved surface like in (f) but without the corner point creating a line in the middle (x)?

Next I would need to trim it with (b) ? 

If the points of the curve profile (y) are out of alignment in (b),wouldn’t that make union with the trimmed surface impossible?