^
Looks trippy.
I decided to give this a shot too. It's pretty challenging so far. 1629.13 feet in, and already making inversions not appear too tight is kinda hard. It's called Superman 64 and the layout represents the player having a hard time controlling Superman due to bad controls. This is not an official project.
The layout viewed from above. The very right edge of the layout may look like it goes past the boundary, but a look in the editor would reveal that it is a little over a foot away from it at its closest point.
Some kind of immelman/helix/inline twist thing.