I built this about 4 years ago... I have about half a dozen of them around the house right now showing stock quotes, weather, etc. and updating every 5 minutes.
https://foundrytechnologies.com/relay.php
One of them has been outside the front door showing messages to visitors and exposed to the Texas elements for all that time now - still going strong. About 2 years ago I replaced the plastic case, which was looking a bit warped.
Sold a few too - though not enough to scale things up. Hardware is hard.