We’ve covered plenty of trebuchet designs here on MAKE:Blog, no relatively lower tech torsion catapult how-to’s though. Well here’s a video and instructable running through construction of a large-scale version – Link
Related:
Weekend Projects: Make a trebuchet – Link

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I made my treb out of craft sticks.
http://farm2.static.flickr.com/1027/1381232191_d9b1ec473d.jpg
In high school we built catapults for Physics class that needed to hurl a tennis ball 25m exactly. We used the bands from a slingshot and 2×4′s. My team took first place of all the entries. Later on during college, my dad gave me the trigger — all that was left of the rig when he scrapped it.
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Make: School’s Out! Summer Fun Guide
This Summer Fun Guide is brimming with over 50 projects for kids of all ages. You’ll also find inspiring young maker profiles, as well as tool reviews written for and by kids! Plus, it’s our 3D issue, complete with 3D glasses and tons of super-cool 3D photos!
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