1-2-3 Truncated Octahedrons

If you join two or three truncated octahedrons at their faces you get two or six different pieces, respectively. Together with the single truncated octahedron there are 1x1+2x2+6x3=23 units, enough for a box with three X-layers of size 5 and two square layes of size 4 between. Other constructions with the whole set or subsets are also possible. Some examples are shown at Mark Owen's site on splatts (https://www.quinapalus.com).