Re: spiral ramp?
it is possible. a couple ways to do it.
one way to do it is to draw the sections of the ramp in much the same way that i drew the path for the handrail. once the steps are in place, you can edit the treads to form a ramp. check out this skp file that i uploaded to the 3D Warehouse:
http://sketchup.google.com/3dwarehouse/details?mid=2ae9f160ce952b5e7843fb4efdc19510
-mike
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