But the landscape was sloping and a curved hill feature to begin with...a long way from a flat landscape.Alton Towers didn't just have a large ready made hole to plonk Nemesis into either.
That landscaping is also the main differentiator that people cite as to why it's superior to Inferno. I'm not saying Paultons need to do it, but it would undoubtedly improve whatever they build if they did.
There is no way they would have quarried that very expensive hole if they didn't have to, to avoid going above the treeline.