Weird Box

This is a present for a friend. It was machined out of walnut and maple. I used 2 milling-bits: one 6mm and one 4mm bit. It should be pretty easy to machine the parts(mainly contours and pockets). The assembly can be seen in the video.
Cutting speeds(6mm): 3600mm/min Spindle:25.000rpm
Cutting speed(4mm):2000mm/min Spindle:25.000rpm

Making of video:
https://youtu.be/6N61enrXnng

Here you can find out more about the machine we use:
https://www.cnc.one