Trebuchette
The very last of the items I was working on before the laser broke. It's a version of this trebuchette modified for 3mm ply. It's quite sturdy and clicks together well so it's a nice kit those guys are selling. I had to modify the bucket to hold nuts and bolts and a counterweight and instead of using string for the slingshot I used a nut and a bit of wire.
Video after the jump