Certainly a good idea. It would be great if something like this could be done. Or better put: If Mattel would want to do this, as experience shows that it actually CAN be done. Based on the premise of the parts swap we are having a MOTUC customizers part swap at the Grayskull Convention. Boil and pop your spare figures, bring those parts and trade them for the parts needed for your next custom. In theory it should work.