So after a lot of research, I finally built my own mirror! I´m using a 27" Dell monitor, an RPI 3b+ and a google voice hat. For the glass, I bought the Pilkington MirroView and the frame was built by a carpenter!
It´s heavy AF so at the moment I have no pictures from the backside but I will edit that in the next time I take it down (usually for backing up the SD card).
I’m really happy with the outcome of this project, and also with the prospect of all the future hobby coding this will lead to. I´m currently testing out a bunch of different modules to find out what I like (and need).