THanks GCN I was thinking it was becasue he was a droid.
I thought really hard about this and actually I wanted to try an IG-88 before but if it is possible, it is way to hard for me. Looking at the Ref pic the problems I see is that the arms and legs are super thin and that the torso is inlined with the outser leg so you can have no hips whatso ever. Now if you can find a way around that then I guess it could work. Maybe a fat IG is the way to go
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Also, does anyone know off han if droids are allowed in the 501st at all? I have never seen the black version of the C-3PO and my friend and hopefully later I will have a working mouse droid. So are droid liked by the empire?