Having done some tests with a Kubricks Mr Freeze, the legs are swappable (is that a real word?) though the movement is a bit limited. With Freeze, I managed an armswap, but by the looks of that Juggs the arms are attached differently. Looking at Kubricks magneto, The headjoints are a bit different, so I'll have to examine Juggs when he arrives and see if scalpels and superglue can do what I want...
Until the little bugger arrives, I can only speculate, but he should be here any day now.