I haven't read the script yet, but I'm not much on dollar figures anyway.
Perhaps an interesting exercise would be to look up movies of similar complexity on IMDb or BoxOfficeMojo and see what their budgets were.
There are lots of people making "micro-budget" films that look good but they cut a lot of corners or do a lot of FX work themselves "for free". Their pictures rarely get distributed, however. Never, really.
A major motion picture that gets a real release tends to be at least tens of millions in budget. "Magic Mike" and "The Hurt Locker" got done for about ~$10 million each, but those were not major effects pictures.