I didn’t see this PC’s specific thread, and I think people may want to talk about this on this forum. The GitHub note says that it was inspired by TRS-80 Model 100. Cool cyberdeck.
@junaruga The Miryoku github repo that you linked is only the layout for it. From what I know it’s purely a layout that’s trying to unify split ergo board layouts. If you’re looking for firmware, they have a few different implementations listed which appear to be different firmware implementations.
I’d highly recommend QMK but that’s just because I’m familiar with it and have had good experiences with it.