I've blogged about Richard Stanley's Hardware a few times now. It turns out a rather talented 3D artist going by the handle kjell has worked up the Mark 13 robot in eye-watering detail. You can see his renders below. He's clearly examined the footage very carefully as he's captured the weird skull with it's under-slung-dragonfly-larvae-jaw perfectly.
I've been doing more 3D work myself recently, but am nowhere near the level of this guy. Great inspiration as to what can be achieved today especially with the latest generation of render engines.