I have used Google quite a bit to try and find this answer. I've tried to scale the 9" model metric with some sort of consistency, but to no avail.
Does anyone have any idea how big these bad boys can get?
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Nominally, 40k miniatures are supposed to be about 28mm scale, or 1/58. http://www.librarium-online.com/forums/hobby-forums/29275-what-scale-warhammer.html#/topics/29275?_k=le2qav
They are not always consistent, but that should at least give you a ballpark that a 9" model would be about 43' 6" tall (9 x 58 12)