I watched the video when it made the rounds last week. I was impressed with the work and the results. I did wonder, though, if a 5 1/4" disk would have been an easier initial goal, seeing as how the outer envelope is a lot less involved than a 3 1/2".
I was expecting a 5 1/4" or maybe 8". But the video was sponsored by a CNC machine company, so 3 1/2" hard shell form factor (the only popular one that can be CNC'd) makes sense. :)
