[bhaidet]

I like the idea of optional legs somebody mentioned earlier - it would go along with the "locomotion" theme but would not be restrictive to new teams.

This is also not a huge stretch from the clue (if we assume that "locomotion" is the intended clue).

I also read something here about a bonus pack to the KOP - could this contain a platform or the "muscles" or something to make a walking robot? I don't know if the lists are published or if they occasionally contain bonus items...