SVG path extrude seems to leave open objects I want to visualize constructing (sliding &amp; press fitting) a few multiplex panels into a table or stool. The shapes of these panels can be provided in SVG or DXF.
The svg is here online. I tried to extrude that shape using this tutorial (skipping the inkscape part).

I only seem to be able to extrude the borderlines of the elements not the surface of the element, also the holes don't look like holes. I made sure that the SVG-paths are closed, but still not the desired output.
Sert the curves to be 2D shape and Fill to Both: