A concept for a record-breaking roller coaster with the most inversions in the world, at 16 in total. The coaster has two lift hills to break up the 16 inversions into 2-7-7, similar to how the Smiler also gives riders a quick break.
I tried to vary elements as to not make it too repetitive, and also tried to make it quite compact - though I think it takes up about double the space of the Smiler.
The element at 1:41 might be a bit too tight, which isn't a problem for the forces, but might be for the structure.
Stats:
Height (lift 1): 35m (115ft)
Height (lift 2): 33.5m (110ft)
Length: 1483m (4865ft)
Number of inversions: 16
Top Speed: 89kph (55mph)
Theoretical Capacity: 1636/hr - dispatch every 44 seconds, 20 riders per train