How to model a stool

Hi all, i’m new in this forum and i’m not sure if this post is in the right place.
I’ have a problem, i have to make a 3d model of this stool


but i’m non able to do the seat. i tried with curvyloft plugin but the result is not so good. Someone could help me?
Thanks in advance

YouTube search and a lot of techniques

https://www.youtube.com/results?search_query=sketchup+sofa

//update
with quads

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