I'd love to see either an Axis coaster or a mack 'semi' extreme spinner, could have it spaced themed like cosmic rewind.
I think especially the axis coaster can be made super compact, and if they can get the seats to rotate to follow a dark ride portion before the main layout that would be great.
As for the extreme spinner, obviously with the space and height it won't be 'extreme', but they could easily sneak in a heartline roll or two - I think we definitely need more inversion based rides at towers. Sure Smiler has 14, but last year when reborn was closed only smiler and galactica featured inversions which felt odd.
Does it say anywhere on the plans if it's just the building thats 18m or whatever it is or the entire attraction? could they dig out the inside of the building is essentially what I'm asking?