This thread was the first one about the Z9 that I found in the day it launched, just doesn't seem like it's been bumped with new info in a while.
As for the topic of glueing, 4 of the Z9 mini specs multiplied is indeed consistent with the hashrate of the Z9 and its power consumption- Bitmain probably just took the boards and threw them in a E3 case or slightly redesigned them to fit in an E3-like case. Perhaps Inno will still drop prices for their next batch of Equihash miners, who knows. They're still ahead of Bitmain even if they don't.
