My gift exchange has arrived! Double Trebuchet Greatness! Answered
For the Instructables gift exchange I was paired up with Biggsy.
They made me this awesome Trebuchet set!
I have two Trebuchet's a red one, and a blue one, with matching little defence walls.
Biggsy said that they work well with marble, but I only had airsoft bb's to hand, which flew very nicely.
I really enjoyed doing the gift exchange, and look forward to any future ones!
When the trebuchet's are not being played with, they are going to live on my shelf of other misc items, to be looked at and fiddled with.