Square-great heptagrammic duoprism

The square-great heptagrammic duoprism, also known as sagishdip or the 4-7/3 duoprism, is a uniform duoprism that consists of 7 cubes and 4 great heptagrammic prisms, with 2 of each at each vertex.

Vertex coordinates
The coordinates of a square-great heptagrammic duoprism, centered at the origin and with edge length 2sin(3π/7), are given by: where j = 2, 4, 6.
 * $$\left(±\sin\frac{3\pi}7,\,±\sin\frac{3\pi}7,\,1,\,0\right),$$
 * $$\left(±\sin\frac{3\pi}7,\,±\sin\frac{3\pi}7,\,\cos\left(\frac{j\pi}7\right),\,±\sin\left(\frac{j\pi}7\right)\right),$$

Representations
A square-great heptagrammic duoprism has the following Coxeter diagrams:
 * x4o x7/3o (full symmetry)
 * x x x7/3o (I2(7)×A1×A1 symmetry, great heptagrammic prismatic prism)