Another road if you want to model it is through subD.
One approach is:
- Draw the outline
- Make a planar surface
- Quadremesh that plane with the number of polygons fit for the shape (Use preview)
- ToSubD the mesh and pull it up with the Gumball while holding Ctrl to extrude it
- Adjust the internal mesh faces and edges.
Note that the SubD will be “smaller” than the outlined curve so you will need to manually adjust the SubD to match the curve again for it to be accurate.