Even if the hard drives parts will never be the same, here some indications:
_ you will need at least 5 hard drives.
_for best results, soldering is the best choice, but a hot glue gun would make the job.
The idea was to mahe a Walker like robot, the head pars were hot glued, I used the HDD screws to connect the legs.
I also made a simple acrylic stand, 'cause the legs are free I can position the Walker wherever I want.
Hope this will help!