Anyone available for code review/advice?

I’m new to Observable and D3 and while I have made progress by the time-honored tradition of googling, reading tutorials, and fooling around, I feel like my code is a mess and I don’t know the right idioms.
Would anyone be willing to take a look at some of my code and offer some advice? I’m particularly
interested in someone looking at this notebook:

because it’s the one that has pushed me the furthest.


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Thank you very much! This is great! I appreciate it.