As (a-hem) entertaining as that was, possibly Wani's legal advisor(s) should have recommended a disclaimer to the effect that, such (a-hem, again) activities on an active roller-coaster should never, ever be attempted in real life.
It's certainly great, I'd imagine. Know what else is great? Sweet, sweet Vanilla.
Still, using her as a model for the rollercoaster, though? Quite the inspired idea.
How nice of the engineers to...willingly be his wingman by stopping the ride.
Choose from either of the following answers: (1) Science, (2) with very few exceptions, protagonists in a vanilla scenario can do such things and survive, (3) WHY NOT BOTH?
1. Build a rollercoaster using the curves of your girl as model.
2. Bang said girl on said rollercoaster.
But is it practical? I don't think so except from this.
Not to nitpick, but he changed between a 69 degree drop and a 69 meter drop. Or is that a mis-translation.