Started to learn how to use a 3D modelisation software named 3ds Max, with the basic functions. So I could design a first model of the shell that will protect the time of flight sensor. It's tiny and subtle, perfect to be placed on the hand. Furthermore, putting it at this place will allow the user to have a greater range.
Here are some screenshots of the first shell's model :

As we can see on the second picture, there are holes in the shell that are made to attach it to the glove : one slot on each side to attach it with a band. And two holes on the bottom to sew it. Just to be sure it doesn't move, for a better accuracy.