I am a subscriber to The Signal Path so I have already viewed this one. In the video you mention the ultimate reason for obtaining the CNC is to mill RF strip line circuits for future video subject material. I am so excited about this and have a request. Is it possible to design and build a USB3.0 PHY side isolator? I have no idea if this is even in the realm of practicality but such a tool would desired by many.
I have checked out integrated digital isolators like TI.'s ISO7631FM which seem to top out at 150 Mega bits per second and 7 nanosec propagation delay, and wonder if they are simply limited by chip process geometry or something more fundamental. Additionally a decapping teardown of one of these chips would also be an interesting video.
As you can tell this subject area is way outside my range of expertise but I figure if anyone could do it it would be you.
(me looking at Shariar's photo with wondrous adoring puppy eyes)