The TFV12 fits with just a slight amount of overhang on the Alien, really not that noticeable.
The TFV12 is a power hog though, I would suggest a 3 battery mod to power this beast. If you use one of the easier to drive coils like the Q4 then it should be fine.
I really like the TFV12 but it feels like I get about 2 tanks before having to charge my batteries. I mainly use the Zenith 3 battery mod with it, drives it well but use higher amp batteries like the Sony VTC5A.
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