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You might want to take a look at the Short-Stock ballista. It's made for a 120x120 platform.

http://www.thingiverse.com/thing:23545http://www.thingiverse.com/thi...

I think MeshLab or Netfabb basic (both free as in beer) should let you break up the STLs into their component parts until I can get around to making that zip for you.

Zheng3 Short Stock Penny Ballista
by zheng3