I believe this is the most accurate figure showing the space pack (look at the top of the silver tanks and then compare with the behind the scenes images poster earlier).
Thanks to the guys over at the RPF there is also evidence of the piece that was used for the tank showing up on the Death Star(bottom right corner).
All research credit goes towards John Danter and the RPF though, im just posting up their findings over here for those who didnt see it before:)
Pinky