nostr:npub1g0wmxtcsjnnmq7x2vdpymczss47ch5gzuwfkw47s22lehvklxa2scpuvzk No idea. Some form of ruling party will decide whether or not a set is good enough to promote it to a full SG set, and it is seemingly kept as nebulous as that on purpose. The model themselves may have to do some form of legwork behind the scenes to get promoted to a full SG model as well, but the whole thing is sort of a mystery.