Read the statement by Michael Teeuw here.
Pre-built frame
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 Another possibility is going to a framing store - one that will professionally frame portraits, photos, etc. Take your mirror glass with you and explain that you want a shadow box with the interior dimensions the same as the dimensions of the glass and a frame to match. The depth of the shadow box will be the depth of your monitor, plus 10mm or so for airflow. They’ll do the custom work for you. 
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 @mrangryoven About what kind of size we are talking? On Ikea you get one with 50x70cm for 20€ here in Germany. 
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 @hummeruli note that u have to have the pi and monitor behind the glass, so behind the glass needs2-3 inches maybe more 
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 @sdetweil If you remove the case from the monitor, so you have only the panel. The best is one with external power-supply. And I read about the Pi Zero W so you don’t have any problem. But the other option is to use the Ikea frame and go to the next toolshop for a wood profil and glue. Normaly they also cut it in the size you need. 
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 @hummeruli yes, just think about it before u order the frame… measure the stuff u have to hide back there!.. 
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 @sdetweil Sure. In every DIY case you must think before you try to build. It’s not like you go in a shop and buy a DIY kit with a 100% fitting manual. And also all tools are in the set. 
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 @hummeruli we have lots of users that bought first and the parts don’t fit together… 
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 @sdetweil Yeah, but the guy do the right, he ask and now… :person_shrugging_light_skin_tone: 
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 @hummeruli i was just making sure… 
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 This is an option although expensive: 


