I've done a few sketches of machines, developed from a few of the silhouettes.
I quite like design 1, i like the idea of long skeletal arms on it. I also like the idea of making it run on a rail. It kind of reminds me of robots from the game portal.
I quite liked the idea of the machine having a window like face. and generally giving it human characteristics. so i've given design no.3 arms and a human like torso, which now reminds me of half of a transformer.
Over all i think design no.1 is my favourite so far, I think its the most striking out of the 4. So I might develop that one further