Essentially, each set of "limbs"/"anatomy" can be re-contextualized on the image itself, via the limbs' own modularity. Each set of limbs is organized into a "group" containing both symmetrical layers in Photoshop, meaning if I select the 'legs', I can move them around on the page and change their location, scale and rotation (and, indeed, change each individual 'leg's location/scale/rotation as well).
And yes, what you should have said would probably have worked better, but I realize that it is patently impossible to see the image and assume the process through which I worked, rather than assuming the more traditional definition of bilateral symmetry
I will probably work more with this style in the future...I DID manage to save the original, anatomically-designed file, so I can play around with body parts, color, shadows, light, etc. essentially infinitely. I predict more pieces like this will show up at some point.