Best Way to Re-Create an Amphorphous Blob

[rwanttaja]

I need to design a part of this shape in Solidworks.


I drew it in Canvas, so it it dimensioned and can be output in various other formats. But I need it in Solidworks to go with other features.

[edit: PRECISE accuracy is not important...nothing attaches to the edges]

What would be the best way to implement this?

Ron Wanttaja