i think in two or three years, they gonna be doin it.
but i see two possibilities of this rail:
1) from the side: it is a complete circle, maybe longer on the ground parts.
from above: the part of the rail, where you hit it, is on the right, and the end part is on the left, enough space inbetween to grease it without loosin your skis.
2) from the side: its not a complete circle, maybe around 300 degrees. there is no flat part. you hit it, come around all the way and land on the same place where you started. This could also be done with a whole circle, so the skier jumps off the rail after one turn.
from above: just straight, maybe 5 inch difference from the start to the end, to make it easier to ride it out.
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