I'm not sure what extra geometry you're planing to add, but here is a way to consider modelling this :
The shape clearly has a fixed thickness with all it's details, I recommend creating the main body as a solid with a flat bottom face, and modelling all the details as solids, for example these details shown in the image below, you can model a fully circular part and position it in the right place, then combine it together with the body, and in the end, you can use the shell command selecting that bottom face of the main body, to create a fixed thickness across all the body, but choose the thickness value carefully not to lose somedetails from the inside.
I've created a quick example to help you understand what I mean, you can find the .f3d file attached to this post.

Saeed Hamza
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