This wasn't the first bow. No the first bow was built using these old Pop Mech plans. However, it was powerful weak, only 20lbs at 28"s. So after further research i found the description of pyramid bows. Not wanting to design another weak bow, I entered the dimensions of the Pop Mech bow into Solidworks and recorded the displacement under a 20 lb load. I then designed the the new bow in Solidworks such that an applied load of 50 Lb resulted in the same displacement as the other bow.