Achieving differing thickness while shelling a body
The base shape is this which I created by blending two sketches.

I would like to remove the top and bottom surfaces and have differing thickness walls at the top and bottom of this object; as in the wall thickness is greater at the bottom and it decreases gradually towards the top.

The closest example to this that I've seen is example 2 here :

I am unsure on how to achieve and help would be appreciated.


