Short note about wether to use touch displays or not.
If using mirror, touch displays is not going to work. Like Wolfgang says, fingerprints is a huge issue, (ofcouse… It´s a mirror).
Using mirror, you could go for voice control insted of touch. That make sense to me.
Using touch displays can be supplied with voice control as well.
My display (whenever I get to that part) will be a 24" inch monitor without touch, with voice controlled (Google Assistant), build into a frame like sheppard´s first message.
I do have a few concerns for my future monitor build.
Atm I´m running a test using a Rpi3B connected to a 24 inch monitor through HDMI (with resolution 1920 x 1080). It seems to be VERY slow when using habpanel and SVG floorplans. I really dont think the Rpi3B is capable of running this in a fast and smooth way. Using my workstation for the same panel, it´s very fast and smooth. So this is an issue of the Rpi 3B I believe. Maybe an Rpi4 will do. Otherweise I´ll have to find somethig as small as the Rpi but alot faster. (Odroid C2 perhaps).
I´m going for voice control (Google Assistant). I guess the best option would be to build in a Google Home mini into the frame to get the visible led respons as well. Unfortunatly it means that the frame width will be rather big. I havn´t figured this one out yet.