I don't even get a Rollercoaster with that stats. There is no help or info how to get the Coaster more fun, more vomit. When there is much fun, it's not enough vomit and much vomit is no fun. I edit nor for about 2 hours and don't get it. This make no fun.
For this challenge there's no such thing as 'not enough vomit'. Check the wording, you have to have "At LEAST 5.0 Excitement" but it says "At MOST 5.0 Nausea". You gotta keep the nausea down.
Also might be worth pointing out that you should keep an eye on the "Total Airtime Duration" on your results tab. I had to push this to 5.1s before it would ping as completed (5.0 did not complete it).
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Also, for what it's worth, I started with the pre-built wooden coaster and then just made a lot of ups and downs in it.