I found this concept by James McDonald.
The one of the far left is my favourite. This is my blockout so far for the body. I'm having trouble figuring out the mechanics underneath the body, please let me know if you have any idea what that spring (I think its a spring coil?) is for, or if you have any suggestions as to how to alter the design slightly to make more mechanical sense.
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update of the high poly. still tweaking things a bit. going to add some things in nDo like the vents on the front. not sure how to attach the axel(?) for the middle joint bit to move the legs, as well as the light in the front needs to attach in some way. suggestions would be great!
Something like this.