G'day and your advice on next years set up

I really like your drawing. I'm going to have to make one for myself to get it right in my first pixel year.
A couple of questions:
You have separate data and power injection. How do you do that gracefully? two 2-conductor cables with water tight connectors? One for data and one for power or is there a graceful and water tight way to set it up with three conductors.
I'm also planning on a 50 pixel mega tree star. Does running the data that far require a null pixel?
Thanks,
Mickey
 
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