Blending surfaces that are compound curvers

 From:  davidb45
4396.1 
I'm modelling an old Mercedes 154 race car and having problems with blending surfaces. The attached .bmp file shows the curves highlighted in yellow. I tried doing a filet but did not have any success. Maybe I need to break down the model into more cross section curves to more precisely define the area in question.

Any suggestions on how to make compound curves blend is appreciated.
Attachments:

Image Attachments:
Size: 172.3 KB, Downloaded: 89 times, Dimensions: 800x800px