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Has anyone managed to make a generic "extrude" mesh surface operation in geometry nodes?

I want to do the equivalent of taking a flat grid, extruding it up 1000 units, and down 1000 units; such that Im left with three copies of the surface connected by faces.

The closes I've come is this; which works but isn't generic. This generates a mesh from curve (using a line profile), then makes a cube and rearranges the faces to fit.

enter image description here

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With the node Extrude (Blender 3.1+) you should be able to get - after I rebuilt your nodes - exactly what you are looking for.

If you use the node twice in a row, and only use the selection Top from the first node for the second, your grid will first be extruded from 2D to a 3D mesh, and then only the top faces.

enter image description here

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