Almost certainly best to bone it to a pre-existing model. In fact it would probably be best to bone it to the Paperdoll, since you wouldn't need any more joints than that for a unit. Of course, this model probably doesn't have quite the same proportions, but this should not be a problem since it's fairly easy to modify imported skeletons. At least, I think so. I have applied the Paperdoll skeleton to a couple of props of my own design, without having to modify the skeleton, but it ought to be fairly easy.
Then it's simply a matter of making the unit...
Then it's simply a matter of making the unit...
