I built this crossbow a long time ago and now I broke it apart for the pieces I needed,
it's a very reliable weapon and ofcourse very accurate :)
you should be able to make it from these pics because everything you can't see at the inside isn't important.
-great range (about 100feet)
-very comfy to hold
haven't found good knex ammunition yet (I don't think everybody has real crossbow arrows)
that's it, I hope you make it and please send me a pic if you build it