I wanted to go for more of a "grouping" technique- worked ok...idk tho i think this design is a no-go...But jdel prove me wrong lol we've done some good work on the last two!! >:D
http://www.fantasticcontraption.com/?designId=11675511 well i just realized this design only has one piece left...whoops

mm
http://www.fantasticcontraption.com/?designId=11675534 mostly done with a part and 30pc left....but prob will need like 50 pc left for powered pults to fling the rest