To create a foot skeleton for Lucy, I essentially executed a 3-D version of a graphic reconstruction done earlier by Berkeley paleoanthropologist Tim White and the University of Tokyo’s Gen Suwa, scaled to Lucy’s size using her preserved foot bones.
This involved casting a number of foot bones known for A. afarensis, including a partial foot skeleton, in a shrinkable material, and shrinking them to Lucy’s size. I then built tendons and musculature and, eventually, skin.
The resulting foot was weird-looking by modern human standards. Even with the big toe adducted into line with the others, the long lateral toes give a hint of the hand-like look of the feet of nonhuman primates.