Create surface and extrude

Very basic shape and extrusion but having brain freeze to make this.
Just want to make this endless knot design into a solid and be able to extrude. Any help to get me back on track? Thanks!

Maybe try ‘PlanarSrf’? and then ‘ExtrudeSrf’ solid? trim out the center parts if necessary.

Thanks! kinda got me on track, still have to fudge with it…