I tried making a Space Invader, myself. http://extremecards.blogspot.com/2010/08/space-invader-pop-up-card.htmlIn your models, I'm wondering what will push the card up and open as the legs do not extend to the base line, and the single blocks at the bottom are not connected to the body.
yeah. i fixed that problem, still being testbuilt though.
Can't wait to see your solution!Carol