Hi tech - in Burr's message here:
http://moi3d.com/forum/index.php?webtag=MOI&msg=5029.5
If you look at the object all the way to the right you can see how he's highlighted just one segment of the circle - that means that he took a full circle and split it up into quadrants probably using the Edit > Trim command, using the other curves that touch it as the cutting objects.
Then with the circle cut up into smaller pieces like that you can then create one of those corner surfaces by selecting the quadrant (it will be yellow just like in Burr's screenshot) and running the Construct > Sweep command and then select the 2 downward oriented lines along its sides as the rails.
- Michael
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