| br>Excellent work and nice to have your work so well documented.
And a video too.
A couple of points about drilling through steel cases.
1. Always use a drill lubricant and go slowly.
2. Swarf around the holes can be easily removed by using a much larger drill, eg. 10mm one on 6.5mm holes, or a special deburring bit. A countersink drill bit can also be used but make sure it can handle the material you are deburring. You can either spin the bit by hand or use your drill and gently press down and allow the bigger bit to cut away the swarf without making the hole bigger.
Tony br> br>