Over the last three months I also built a magic mirror. But I thought some voice activated controls would be neat. You can check it all out on Youtube:
https://www.youtube.com/watch?v=6tQ03_GB7LQ
It was fun and I did learn a lot (I didn’t know any programming language before, now I know at least some basics of Python).
If you plan to build your own mirror, I do have one very important tip for you: never underestimate the space cables will take up!! This gave me a lot of headaches when I was finally assembling everything. The small wooden “box” under the mirror houses the pi (almost not enough space) and the microphone (old USB-camera) but i planned to also put the power cords in there - no way! So, when you plan your own, allow for a lot of space for cables and such. Also, measure how much space the Pi takes up with all the cables connected!
Anyway, have fun! And please do tell me what you think of my version of the Magic Mirror!