Incredibly well executed Youtube project IMO. The DIY many-poled rotary encoders are particularly gorgeous cost engineering in a hobby project like this.
I have a fun omega-3 anecdata point going right now. A friend of mine researches the stuff in mouse models and told me it's extremely beneficial, but you need to buy a fancy brand to avoid rancid oil or heavy metal contamination both of which ~null out the benefits. She recommended Sports Research.
I bought some and started taking it and my 1:1 bullet chess ELO jumped from 850 to ~1070 over the next couple weeks.
I play chess a bit like sushi ginger for the mind - purge working memory with a short intense task to context switch. I intentionally don't study openings or anything so I can use it as a benchmark for mental horsepower with a reasonably slow drift in the baseline from 'actually learning chess'.
My friend says this effect is way too big to actually attribute to the vitamins and it has to be placebo etc but I'm thoroughly enjoying the idea that omega-3 Nick would win 3/4 bullet matches against deficient Nick.