I did this project a few years ago. Now it just sits on my other desk and collects dust. I never really got around to painting it. There's also another cutout on the top of the case that isn't completed yet. Anyway, thought you might be interested.
Everything was done with a cutting wheel and these bits highlighted in the picture below (carbide version):
Oh, <b>JStrider</b>, your best bet is to just repaint the case. If you cut from the front, you probably will have some damage from the bit moving around on you. And if you go in through the back, you'll have small pieces that bend out towards the front which will have to get sanded down and probably ruin some of the original finish anyway.