How to create particular shape?

[jure8]

Hi Everyone! I'm new on this forum and I'll be glad if someone could help me. I would like to create 3d model of this object

So far I've done almost everything but now I'm facing a problem.
How can I create the thing that is missing on my object. This green shape on third picture

I hope someone could help me. Thank you!

[Gaieus]

Hi Jure,

Download Soap Skin and Bubble plugin.

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[Aidus]

Soap Skin & Bubble can do this:
http://www.tensile-structures.de/sb_software.html

I'm too late Gaieus

[pilou]

Or Extrude Edges By Rails (by Lattice) by TIG if you have 4 curves
better if profil / profil & rail /rail have same number of segments!
Ps You can deform it with FFD by CPhilips

[jure8]

Gaieus, Aidus, Pilou thanks for your answers !
I think I'll try with SoapSkinBubbleTool.
Thanks again!