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 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: where j, k = 2, 4, 6.
 * $$\left(2\sin\frac{3\pi}{7},\,0,\,2\sin\frac{2\pi}{7},\,0\right),$$
 * $$\left(2\sin\frac{3\pi}{7},\,0,\,2\sin\frac{2\pi}{7}\cos\left(\frac{k\pi}{7}\right),\,±2\sin\frac{2\pi}{7}\sin\left(\frac{k\pi}{7}\right)\right),$$
 * $$\left(2\sin\frac{3\pi}{7}\cos\left(\frac{j\pi}{7}\right),\,±2\sin\frac{3\pi}{7}\sin\left(\frac{j\pi}{7}\right),\,2\sin\frac{2\pi}{7},\,0\right),$$
 * $$\left(2\sin\frac{3\pi}{7}\cos\left(\frac{j\pi}{7}\right),\,±2\sin\frac{3\pi}{7}\sin\left(\frac{j\pi}{7}\right),\,2\sin\frac{2\pi}{7}\cos\left(\frac{k\pi}{7}\right),\,±2\sin\frac{2\pi}{7}\sin\left(\frac{k\pi}{7}\right)\right),$$