Below some naive NURBS-to-polyhedrons curves traced in tS have been converted in SVG and imported in Inkscape. Further - yet more naivest - elaborations have been made with it.
The plug-in get the outline profile of the curves (no fill in it) both the curve is got from context's nurbs extrusion and then converted to poly or converted to poly through the appropriate button or sweeped with "size z" > 0 as long as it isn't rotated along xy axis (top view is assumed). To make the "shape within the shape" is enough to set the "location z" freely up or down. The curve are exported grouped and locked; hence the relevant operations to work on each curve point or on every single shape is left to the client SVG program. I've tested OK the SVGs both on Inkscape and on GIMP. I don't know how they behaves on Illustrator; but the SVG is very basic, without any further reference or comment; so it would work. As always feedbacks are appreciated on this matters.
At least one does make an heightfield of the page and then extrude all. 
