> Possible interest. Do machinas ever go so far with their cybernetic enhancements that they no longer resemble humans? 

This can be the case yes. Though Machinas still retain some of their organic parts internally, they may change their physical appearance on the outside. For example you may see a Machina with digitigrade like legs or an forearm replaced with a scythe (though as cool as that one sounds, its probably not so great in a practical sense).