Oh, and if your planning to scratch-build a Jet Pack, here's the thread for the templates.
http://www.thedentedhelmet.com/showthread.php?t=7559
there should be a link on the first post, click on it, and save.
though, you might already know this.
if you want, you can go in many routes. one, you can use sintra, like prymer13 said (sintra is expanded pvc plastic, so basically it's a board of plastic). just print out the templates at full size, and cut them out on sintra. Sintra, note, is easily pliable, simply dip it in boiling water for about 20 seconds, and you can just shape it. note that when it is heated, it releases toxic fumes, so i would say maybe try to do it outside, or just leave the window open in the kitchen.
another route is the Lisafett tutorial, here in this link.
http://www.azeem2000.com/
click on
articleand somewhere on the bottom-left corner you should see
boba jet pack tutorial ready for downloador something similar.
yet another route, which i found on TDH (thanks Wasp for the idea!) is to make a card board Jet Pack (by using the jet pack templates) then cover it with paper mache. here's a link to how a member did this once.
http://www.thedentedhelmet.com/showthread.php?t=8066&highlight=Cardboard+Jet Pack
note: this is his own way,
you do not have to do what he does
P.S. Jet Pack can be shortened to Jp, so Jet Pack = jp