mouse
Giga Poster
You say 'you can't even build a hyper' as if it's not that tall, a hyper would be unrealistic for most UK parks with much more leniant restrictions. The higher sections of Rita and air have been disguised to blend in with the tree line, so I would assume it is to do with line of site and not a specific height as such. I dont think there is a feasible way of raising that line, but I would guess the tree line is higher in some areas of the park?