Modeling smoothly blended fuselage and vertical tail

[WK95]

I want to create an aircraft empennage which is blending in with the vertical tail as illustrated by the following picture.

I tried doing something similar but the surface isn't smooth as shown by the attache picture with zebra stripes.

What am I doing wrong?

Ideally, I want to model an empennage like this one.

 

[JeniaL]

Don't you want to control surface with more sections? Try to add more sections and see where this will bring you. Run connect checker and post a screen.

 

[WK95]

The only sections that I nee4d to control most critically are the vertical tail airfoil sections.

The image I posted isn't intended to be reflection of an actual aircraft though, I just used ovals for the sections because they were quick to make.

And the reason I used the sections and guide curves like I did was because, as in the first picture, I wanted the fuselage to blend into the vertical tail surface smoothly.