About this 3D model

Quick, easy and dirty OpenSCAD to make a low poly klein bottle. Ehem... Quick? Not as much as I thought (1h-1h30) Easy? Easy would have been using cylinders $fn=3 instead of polyhedrons! Dirty? Yes! It looks like a parametric thing but it's NOT! Low Poly? Neither, OpenScad reports 40 faces but there's some misalignment that's adding 4 more than needed.