Heptagrammic-great heptagrammic duoprism

The heptagrammic-great heptagrammic duoprism, also known as shegishdip or the 7/2-7/3 duoprism, is a uniform duoprism that consists of 7 heptagrammic prisms and 7 great heptagrammic prisms, with 2 of each meeting at each vertex.

Vertex coordinates
The coordinates of a heptagrammic-great heptagrammic duoprism, centered at the origin and with edge length 4sin(2π/7)sin(3π/7), are given by:
 * (2sin(3π/7), 0, 2sin(2π/7), 0),
 * (2sin(3π/7), 0, 2sin(2π/7)cos(2π/7), ±2sin(2π/7)sin(2π/7)),
 * (2sin(3π/7), 0, 2sin(2π/7)cos(4π/7), ±2sin(2π/7)sin(4π/7)),
 * (2sin(3π/7), 0, 2sin(2π/7)cos(6π/7), ±2sin(2π/7)sin(6π/7)),
 * (2sin(3π/7)cos(2π/7), ±2sin(3π/7)sin(2π/7), 2sin(2π/7), 0),
 * (2sin(3π/7)cos(2π/7), ±2sin(3π/7)sin(2π/7), 2sin(2π/7)cos(2π/7), ±2sin(2π/7)sin(2π/7)),
 * (2sin(3π/7)cos(2π/7), ±2sin(3π/7)sin(2π/7), 2sin(2π/7)cos(4π/7), ±2sin(2π/7)sin(4π/7)),
 * (2sin(3π/7)cos(2π/7), ±2sin(3π/7)sin(2π/7), 2sin(2π/7)cos(6π/7), ±2sin(2π/7)sin(6π/7)),
 * (2sin(3π/7)cos(4π/7), ±2sin(3π/7)sin(4π/7), 2sin(2π/7), 0),
 * (2sin(3π/7)cos(4π/7), ±2sin(3π/7)sin(4π/7), 2sin(2π/7)cos(2π/7), ±2sin(2π/7)sin(2π/7)),
 * (2sin(3π/7)cos(4π/7), ±2sin(3π/7)sin(4π/7), 2sin(2π/7)cos(4π/7), ±2sin(2π/7)sin(4π/7)),
 * (2sin(3π/7)cos(4π/7), ±2sin(3π/7)sin(4π/7), 2sin(2π/7)cos(6π/7), ±2sin(2π/7)sin(6π/7)),
 * (2sin(3π/7)cos(6π/7), ±2sin(3π/7)sin(6π/7), 2sin(2π/7), 0),
 * (2sin(3π/7)cos(6π/7), ±2sin(3π/7)sin(6π/7), 2sin(2π/7)cos(2π/7), ±2sin(2π/7)sin(2π/7)),
 * (2sin(3π/7)cos(6π/7), ±2sin(3π/7)sin(6π/7), 2sin(2π/7)cos(4π/7), ±2sin(2π/7)sin(4π/7)),
 * (2sin(3π/7)cos(6π/7), ±2sin(3π/7)sin(6π/7), 2sin(2π/7)cos(6π/7), ±2sin(2π/7)sin(6π/7)).