Hi, I am looking to model an automotive arch using sheet metal. I have formed The shape  need but I require a sweep that is not planar. 

Please note the attached images of the 3D model here, 

I have tried to create this fender component formed from two sheet metal components but i cannot create the swept piece circled above in red.

All I can do is create this area as a straight profile as shown below.

What I am thinking about doing is adding extra material on this last section and cutting it when I mock it up.

Ideally of course I would prefer to create this in one piece without any major modification. How easy is it to create this?

Im thinking it would only be posssible to achieve this sweep by adding some relief cuts,  but the next issue would be being able to create the sweep as shown in the very first image.

Any input would be greatly appriciated.

Thanks!!

Ryan