>>9129611I haven't built the zeta, but I have gotten the two frame expansion packs. Pic related is if you pick up a normal cross frame. you basically get adjustable/swing out shoulders, longer legs/thighs, and longer arms. If you pick up a cs frame booster pack you can get even longer arms and legs, plus some beam saber hands and two different styles of thighs (rounded and squared). Definitely worth picking up if you want to use more dynamic poses for your sd kits. Plus the booster pack comes with parts to give your sd bb senshi proportions as well if you really want to do that.
