Hey,

i used a basic wooden frame and a 24 inch monitor.

Monitor
i used this monitor, because its very flat and had the perfect size for the 60x40cm glass:
https://www.amazon.de/gp/product/B01AJTVCA8

i did not remove any plastic from the monitor, so i can reuse the monitor if i want.

Glass
http://www.glas-per-klick.de/spiegel-antikspiegel/spionspiegel.html
(german website)

it has 3% opacity. For me it was important, that you can’t see the monitor that well (gray background light), so this one was a perfect choice. Maybe in an open room with sunlight you need more opacity.

What i may do
Silicon gap between mirror and wooden frame
Add motion sensor for energy saving purpose
Build some modules for smart home

Screenshots

2_1486835942201_mirror3.jpg
Ready mirror

1_1486835942201_mirror2.jpg
Back of the mirror

0_1486835942201_mirror1.jpg
For the front border i just used a wooden strip from my local shop