If the glass is to have holes & cutouts in it, it will have to be safety glass, i.e: Toughened Glass.
Problem with Toughened glass is, it is not flat. As it is toughened using a horizontal furnace (that has rollers that it moves along on), the glass actually comes out with waves in the glass. This is caused by the heat and the gaps between the rollers, which I guess sort of causes the glass to sag a tiny bit between the rollers.
If you have a sliding glass door in your house. Have a look at a reflection in it, but from an angle (from the side) you will see all the distortions in it.
So it's not flat.
The ball will scratch the crap out of it.
There is also a limitation to holes being too close to each other, cutouts too close to edges etc.
Just my view.
 
Bruce