I installed Magic Mirror on my PI the other day (took for ever to install)
I mainly wanted to see how well it would work with HG and my X10 setup. I installed the full version not just the Server part which is what I'll be using. I see now most users are using either the onboard Pi camera or a USB one more for motion detection,
though you can have it take pics. I've not configured MM just yet but the full version does tax my Pi 3B+ so I'm expecting some instability.
I've read the server version will run on a first gen PI so running that will be the way to go I believe.
I've also got my SmartMirror frame which will hold my x10 Airpad just about finished I just have to paint it.