Model this in Catia?
That picture is a little vague.
But I'm going to guess that there are 4 mounting holes on the bottom plane and one hole in the top left (the one with the white circle around it)
Start with 2 sketches. One top down view sketch, outliinng the shape of the bottom part, and a second sketch that is a side view of the part.
Extrude each sketch, add cutouts where you see holes in the part, and give generous radius to most edges...
That should get you most of the way there.