LINK TO EXAMPLE WINGS:
LINK
In this little tutorial i show how to create wings with variable fuselages.
First step: create wing shape:

After this create middle part of wing and control surfaces:

Next step: mirroring. After this you should to set negative X-scale of variable fuselages by the Overload mod. Scale should be (-1,1,1)

But after mirroring all attachment will not work:

You should to attach all parts of wing manually by the DesignerSuite mod:

Wing is ready. I know that It is not very comfortable to create wing with variable fuselages.
Great!
@MOPCKOEDNISHE thx man for this useful tips
@Tessemi No, this is work not like 3d-max or Blender. I set the vertices position in the code.
@Tessemi No. Very fuselage have only 5 veritces on one side - and you set the position of this vertices bu slider in part attributes. For this reason variable fuselages so... low polygonal
@Tessemi
@Syabil Wing tutorial