As a huge fan of Scrapheap Challenge (aka Junkyard Wars), I've seen quite a few catapult/projectile-related episodes. So I'm currently compiling a list of episodes available on YouTube.
Excellent! I loved Junkyard Wars back in the day, especially before they "reality-i-fied" it. Your first link was the show that got me started with hurling machines. I build a small treb and a small onager the next day