Hi guys,
I am wondering if someone can recommend an extension or tool which will help me create a model which looks quite similar to this

Hi guys,
I am wondering if someone can recommend an extension or tool which will help me create a model which looks quite similar to this

Try using SUbD. You can download this extension by clicking on either of the boldfaced links below:
Here is a video showing how to use it.
How to use SubD in Sketchup (Subdivide Quads in SketchUp)
If you’re looking for a free alternative, you should check Curviloft plugin. Skinning feature of that plugin suits for this.
In the video below i drew lines with Bezier Spline plugin and gave thickness at the end with Joint Push Pull Interactive plugin.
Or you can use Bezier Surface extension.
Thanks filibis!!