Blending surfaces that are compound curvers

 From:  davidb45
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.

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