If I am not fuzzy on the details, wasn't a old Giga plan indicative that they'd have the coaster pointed "away" from residental? And that for the most part that it would've combined the use of the parking lot surrounding Soak City, the Marketplace, and a portion of Ghost Town?
I can be wrong, but I agree with
@Freak that if USH could figure out a multi-inverting outdoor coaster of a high scale, Knotts could figure out a GIGA (especially if it was developed with the residential area in mind).