Model a shape with multiple curvatures How would you approach the modeling of a shape like this (circled in red)?



The goal is to have a model for CNC. I am still quite weak with modeling so I am not sure about how to address this. What I did for now has been extruding the shape vertex by vertex, trying to keep only quads, adjust the Z of some of them, adjust the crease and apply a Subsurf modifier. 

How would you do this? Please without sculpting.
Alberto, I'm not sure to see exactly the same thing as you, but anyway here is how I would do it. First I show how I would correct your own topology so that you can have a curved face. And also it looks like there's a slot in the middle of a face, so I also tried it.