To get started packing space with cuboctahedra and octahedra, I started with a single octahedron, then augmented its square faces with additional cuboctahedra.
Next, I augmented each triangular face with a blue octahedron.
Next, I augmented each square face with a cuboctahedron.
Next, I added still more cuboctahedra.
The next step was to augment the yellow triangular faces with blue octahedra.
I next added more cuboctahedra.
This process may be continued without limit. I used a program called Stella 4d to make these models, and you can try this software yourself, for free, at this website.