Okay, now we are finally getting somewhere. I am willing to help you out. For safety reasons make the - exact copy - during the day.
I don't see anything in your Hackpen circle that would be especially hard to make.
Did you watch your own video link? The cross hatching shows all the signs of being done with boards. I'd ask that you go back to that video and watch the part where they are taking video on the ground, and look at the cross hatching especially.
What if there were 100 people involved? Would it still be impossible?
Edited by DieChecker, 28 July 2013 - 07:35 AM.