Small ditetrahedronary cubihecatonicosachoron

The small ditetrahedronary cubihecatonicosachoron, or siddatchi, is a nonconvex uniform polychoron that consists of 600 cubes and 120 small rhombidodecahedra. Eight cubes and twelve small rhombidodecahedra join at each vertex.

Vertex coordinates
Its vertices are the same as those of its regiment colonel, the small ditetrahedronary hexacosihecatonicosachoron.