Ran across this on the local Craiglist!
Looked up the website and they are made a few miles from my house.
http://www.easyhelix.com/index.html
For all those who don't want to build their own, here is the website where it looks like you can order out kits or have it custom made for your specs!
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Wow! That's cool! I wish they had this available back when I was building an HO layout years ago. I have since gone away from the dark side. 
SPECIFICATIONS
Height:
Roadbed to Roadbed: 4” Spacer Tubes are inserted between levels.
Track Spacing:
HO 20 scale feet (Double Track)
N 18 scale feet (Triple Track)
O 11 scale feet (Single Track) (Distance to Spacer Tubes)
Standard Radius:
Inner 28.000 inches
Center 29.375 inches
Outside 30.750 inches
Easement Radius:
Inner 44.000 inches
Center 45.375 inches
Outside 46.750 inches
Looks like this would be a little to small for O-gauge. Unless you can increase the size of the tubing that is being used for the spacers. You may get 054 track to fit on it.
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