Make a sub-d (or facsimile) cube. Select each face on the cage, extrude and globally scale them smaller. Extrude again and translate them towards the center of the cube. Delete the faces. That should get you in the ball park. Note, I dont have maya in front of me so you may have to experiment on your own but that should give you a general idea of how it's done.
"Terminat Bora Diem, Terminal Auctor opus."