Well the internet liked the idea, and saw some of the same promise in it that I did (plus HN is a sucker for e-ink). With all the interest, and people asking how they can get their hands on one, I ran a crowdfunding campaign to make devkits for everyone who wanted.
Turns out making 25 of something is way more work than making 2 of a thing. The supplier changed the display firmware on me, I had to make things to more exact measurements so parts were interchangeable, I had to write docs and make videos, etc etc. Took a whole year.
Now the pressure is off and I don't owe people products after they gave me money for them, so I can take a break to clear out my backlog of minor projects, then get onto designing my own game, using my own devkit :)
Once I have an actually fun game, I could increase volume and bring down the costs. My goal is to make the game accessible for $80. I'll need the e-ink price to come down a little, and use injection molding instead of resin casting and wood. Plus the base won't need a Raspberry Pi, that's just for my quick iteration. Final product will need to be embedded.
(Almost all the devkits sold were to friends and family, with only a few going to actual game designers. CrowdSupply itself puts in an order for more units along with the campaign, so that they can stock them after the campaign ends and initial delivery is over. Except they negotiate a different price for those because the margins work differently)