It does not need to be exactly the same-just to give the viewer the idea
I got this far
I need to create a surface that connect the perimeter of the blue surface with the perimeter of green surface. Is there a plugin or anything that does that ? The vertical black lines can be deleted if needed
So as @Anssi wrote you could do what you need with the Sandbox Tools or the Curviloft extension. You could also use TIG’s Extrude tools. It could even be done with the native tools by starting with a cylinder and selectively scaling and resizing one end to make it an oval.
Thank you guys, profile updated
Some of these extensions are not really user friendly, in particular for beginners like me
If I do something wrong they just keeps produce error sounds … really frustrating
If you spend some time at The Learning Center, you will learn how to use the tools to get what you want. (interactive tutorials) Also, go to The SketchUp YouTube Channel and pay attention to the Square One series. Both are sponsored by the SketchUp Crew and well worth the time spent there.