quetzalcoatl1967 - You do like setting yourself challenges, don't you?

I'm old enough to remember the Tripods TV Serial from the eighties (BBC ; don't know if it ever made it across the pond). One thing I remember is that the tripods walking were extremely unconvincing in that.. They only ever showed them walking for a few seconds and they looked like they were about to fall over as soon as the camera was off them. (these would have been physical models, of course).
  I think there is a basic difficulty in making a 3 legged creature walk. Maybe thats why no animals are born with 3 legs? I think realistically the only way to do it is to treat it like a one-legged man on crutches, with the two outer legs moving together.

I've seen the War of the Worlds critter as well, I think it might have been at Daz, but don't quote me! My memory is it was not fully articulated.

 

"Don't make me angry. You wouldn't like me when I'm angry!"