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Great article on stellated forms! I almost missed it due to the subtle unintuitive title!
The fact that f(L^2) is positive can be seen without inspecting coordinates: after all it is the length of e_i', hence positive.
Related work-in-progress if you like polyhedra and tiling transformations: https://ixxyxr.github.io/polyhydra-web/

It has the Kepler-Poinsot polyhedra and allows you to apply a superset of Conway Operators to them. No true stellation currently (stellation isn't an edge-replacement operator so can't be mimicked by Conway-esque operations)