I feel like a giga would be extra difficult at Knotts, because: 1) the park is geographically smaller and more compact, and 2) the very close proximity of local residents.
I mean, I suppose it's not out of the question if it's carefully designed and they jump through the legal hoops... but thinking of those "scream shields" Disney had to put on Screamin, and those residents aren't even as close, makes me think a giga would be impractical. I'd love to have one there, but I just don't know if it's realistic.