any advice about modelling this shape

 From:  John (OKEN)
7944.11 
Hi Guys,

Or you've got Vector Magic Free

https://vectormagic.com/

Automatically convert JPG, PNG, BMP, and GIF bitmap images to true SVG, EPS, and PDF vector images online by simply uploading them. Real full-color tracing, no software to install and results are ready right away!

Hope it helps ;)