Here is one idea, for example:
https://fstop138.berrange.com/2016/0...umen-printing/
There are some mentions of the spacing of the LED strips, but there does not seem to be a set rule.
Here is another box construction:
https://www.photrio.com/forum/thread...re-unit.176241
I still haven't gotten around to buying a soldering iron and learn how to do this, but some time in the future ...
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