Hi. That is tough case for RC.
I have used few cheats and the style will not stand to what You might need in some cases. You need to play with welding distance for each parabola.
I used vertex weld feature to weld top parts.
I used parabola formula
to define the curve. So You need to adjust those parameters to get the shape You want.
Added few parameters to play, like spacing, or top part resolution.
Hope this helps.