Originally posted by Dirk_Ermen
The idea is cool for a coaster but the forces and weight from a steel coaster are much more than on a slide.
The roof alone would need such a strengthening just to carry the weight of the track. So it's about impossible to have a running coaster of 2-3g hanging on the roof.
It's a jet coaster, so I'm pretty sure the scaffolding wouldn't have to hold up much more than the weight of the track; the forces are so slight that they're basically negligible.