You can download the level from this site too. This is something that cannot easily be done with the version of MazeD present in 0.15r002. Check out the curved surfaces that are used a lot in Quake 3. It appears that CS curved surfaces are very compatible. In the last screenshot you can see the edges of all polygons and triangles for curved surfaces.
All blue lines are for curved surfaces.
The third screenshot is an OpenGL rendered screenshot of the Squawk prototype game which is included with Crystal Space.