Polyhedra via Conway Operators in OpenSCAD

Conway operators allow a wide range of polyhedra to be generated as transformations of the Platonic solids. This openSCAD script implements all the operators + George Hart's propellor + few other additional functions, including one to generate a cutout shell used in the samples

The script uses language features [ concat, list comprehension, let() ] only available in versions since late 2014

The sample solids are
gD - the Catalan solid Pentagonal hexecontahedron
emD - modula