Dremel do a special drill bit, it isn’t particular to Dremel though, they just do dinky versions. The problem is you use it with a drill press. You move the drill bit laterally and it works a bit like a milling machine. However, you’d need that plate off the back or a much better drill press (to clear the back of the case)- the drill bits are widely available and obviously with a ‘grown-up’ drill press and drill you can do more with MOR POWA! Dremel is great but I find it underpowered above 1.5mm and the benefits of a Dremel are somewhat lost once you put it in a drill press.
The drills will break/blunt but it is a sort of cheats version of machining. Many years ago, I was into model engineering (model trains) and it was a common cheat for those of us who couldn’t access the ‘proper’ equipment.
Another one I have learned. Someone asked me to make motherboard trays out of 3mm guillotine cut aluminium recently- as you guys will know that is quite easy. I just ordered 200mm square sheets. However, they weren’t happy as they wanted a lot of cut outs and they wanted the trays smaller. I used a tile cutter to reduce them down and it works. By tile cutter I mean the flat bed electric thing with a grinding disk, they are sub £100 in the UK and I had one. The disk was about £3 for a decent one. You wouldn’t want to do it all day and obviously the grinding disk doesn’t last for ever with aluminium- but it works for straight cuts. Because the tile cutter is relatively small you can fit smaller disks- you do need to let the disk run up to speed on mine as the torque is very low.
Also it files it down really well as it is abrasive. The disks are 3mm thick, maybe 2.8mm. You can get thinner but I didn't.