We can only offer material up to a thickness of 10mm.
However, side holes are possible. We would need an additional Front Panel Designer file for the side (in front view as you look on the side.) Please also make sure you have "customer provided material" checked and leave us a note in the remark box how to machine it related to the front of the panel.
I hope this makes sense. If not just call us and we walk you through the process.