It is not physically possible to raise the track to 12' in this room with a 6' diameter spiral. The spiral extends back 6' from the 12' high wall toward the 9' high room wall. The ceiling has a 30% slope to get from 9' to 12' in a 10' horizontal run. So the spiral will touch the ceiling where it is only 10'-4" high. With a 3% grade on the spiral, then one half of the spiral return to the 12' wall gives 3" of additional rise to a maximum height of 10'-7" for the track. I did a small amount of rounding off on the numbers. Assuming we are starting with an 8'-6" track height on the 9' high wall, then the height of the track on the 12' wall will be 10' to 10'-2".
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