Not interested myself, but it's not really clear why you can't use one of the hundreds of already created themes out there? Actually the stock Reaper theme has the thinnest of the narrow mixer layouts to show the most tracks on screen. What is it about that theme or others that don't work for you, or what is it you really need? That's probably where you should start. It may be as easy as modifying a currently available theme to suite your needs which would be much less work for whoever.
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