I don't have pictures ..but if you get the dermal gray drill bits I think their are 6 or so sizes in them ..
I just use my fingers and turn the bit with my fingers under their feet...
I drill in 2 or 3 mm then I get any stick pin use a dab of super glue and (pun ..."stick it to them" )
I leave around 3/8 or so of the needle out of a leg.. then just put them in your foam or if necessary drill your ply-would same way.. whats nice is you can move them "anytime" anywhere.. makes you know when someone is really paying attention to your details...daniel