PoSBa = Perforation of Smaug Ballista As I said, I have started the build. The weapon is chambered for 240 cm shafted 20mm "arrows" that can have fours fletchings (40mm max height each). Total net draw length is 223 cm. Here you can see the winch box with the "maxim gun style" handles. The multiplex boards carry the load, the cheapo particle board is just for looks (will all be painted black later on). The trigger box will actually be pulled back by the winch. This ensures a speedy loading routine. You move the sled forward, clamp in the rope, cock it back with the winch, load the arrow from the front and you are ready to fire. Here you can see the "fork", a much shorter version of the four armed crossbow prod the movie prop features. This adaption will make it more effective and solid, while a part of the original design remains. Next, the winch mechanism. Then the weapon will already shoot - it will be time to build the mounting frame.