I was about to comment that I also made a small LED panel, but then realized it was me.
Here's the latest LED thing I'm working on (the design isn't mine): https://immich.home.stavros.io/share/oXerU8gnLn-dNHunPOg8lM8...
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Here's the latest LED thing I'm working on (the design isn't mine): https://immich.home.stavros.io/share/oXerU8gnLn-dNHunPOg8lM8...
.. and, I recycled some old scoreboard display panels to make something similar to your latest project, also:
About the panels: https://metalab.at/wiki/Blinkofant/LED-Display_History
The Blinkophant: https://i.imgur.com/3aPytEp.jpeg
We devoured the panels and did all kinds of funky things with them.