They gave Dooku the plans for safekeeping, but production was moved to the Genosian weapons yards for construction. But when the Emperor decided to scale up production, they started enslaving Wookiees and other races to help and at some point the Genosians were given the boot. (I think most of that is covered in one of the novels, probably “Tarkin”, which I haven’t read yet, rather than “Rebels”)
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