Just to give my 2p. I run MM on a RPi in serveronly mode and then use a Fire Tablet as the display device inside of a small Ikea RIBBA frame. You do need to sideload some applications to get the best experience like a fullscreen browser and better brightness control, so it takes a little effort but it great for a first, cheap, Magic Mirror.
A single app would be easier, but MM2 has much more flexibility and customisation potential. I’m already working on a bigger Magic Mirror that will have sensors to detect when people are in front of it, integrate temperature sensing and many other things.
I’ve certainly learned a lot from just reading the forums and playing with modules, its worth it for the best experience :)
@TGBB No, it won’t work. The reflective coating on the back of your cheap mirror is an all-or-nothing thing. If you scrape it off, you’re basically turning your mirror into a window.
Do some searching for a glass manufacturer. I know there are several people on this forum from the UK. Surely they can point you in the right direction. Worst case scenario, you can talk to your local glass shop / glazier and ask them to broker the purchase for you. That way you can depend upon their expertise in the industry to source the mirror for you.