It doesn’t need to be any more complicated than the 6 unit version - just a different symmetry.
For something like this it makes things much simpler to do it all around the world origin first, then orient it wherever needed.
If you want to replace the tetrahedral unit, don’t modify the inputs to the Kangaroo part, just position and scale your new unit so that its axes line up with those of the existing tetrahedron and input the new geometry in place of the highlighted mesh input.