Come on now, Celuien, haven't you read your textbooks? Mount Zoom surpasses all laws of physics and has been a Middle Earth Legend ever since Sauron dreamt about it!
Lets say that the Zoomology was a Sauron innovation that went nowhere as he didn't have the technology at the time but with the introduction of Dweomer, it became plausible. Hence Smilog being assigned to Mordor.
...
Yeah, that'll do.