Hey all so I built me a trebuchet lol more details and writeup to follow just firing it in the field now
Good clean lockdown fun current record is 45 feet not bad at all.
I bought the plans from https://www.fishersshoponline.com/ for a couple of dollars well worth it IMHO (have no relationship with them)
and he has a video here too https://www.youtube.com/watch?v=r1-CTPuzJDM
** Edit for adding links to plans and tube video