I just implemented a MagicMirror for our home. Video footage of it working.
Basically I used the open source http://github.com/MichMich/MagicMirror. I had to do a few changes. I added a hideall module so that everything is hidden and comes visible on detecting motion. My sources are at https://github.com/bonggeek/hideall
This is the first prototype working on desk monitor with a 1mm two-way mirror held in front of it.
It was evident that the thin 1mm acrylic mirror is no good, because it bent easily giving weird distorted images. I moved to a 3mm 36” by 18” mirror and started working on a good sturdy frame.
I used 3x1 wood for the size which is actually 2.5 x 0.75 inches. On that I placed a face-frame.
I had a smaller 27” old monitor and decided to just use that. I mounted and braced the monitor with L shaped brackets. So it is easy to take out as well as hold the monitor firmly in place.