Help creating smooth armor pieces

Hi, I have been trying to create this armor part but I can’t get an smooth base nor the right shape, I’m not working at scale yet but this is the reference picture and my failed attempts. Also no idea on how to make the ribbing.


Can you help me please? I’m new to this

Thank you

This are my failed attempts

They do not look bad. Have you looked at the guided loft tutorial? I think that would be your best bet. 3D modeling a power drill handle | Shapr3D step-by-step - YouTube