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Actually I only know those ones

Fraptools Plug: not really "modular"

KAHNCO Modular: the best one I've found, but the guys don't respond to emails
and there's no place to purchase it...probably never launched
http://www.kahncomod.com

SP-1: the only real modular-modular case
https://www.matrixsynth.com/2019/01/the-sp1-eurorack-case-modular-3d.html

do you know other similar projects?