I borrowed heavily from pictures here and elsewhere and other research, including a paper on the subject of SCUT FEL design principles I found on the internet. Plus a lot of advice and information from other B7100 owners right here on this forum.
Initially, I was looking at adapting plans by PF Engineering, but came to the conclusion that I was better off starting from scratch. His plans were really aimed at something smaller and simply scaling it up wasn't looking good.
I took a pile of measurements and started laying things out in a drawing program (some of those drawings can be seen in
this thread). I did a lot of cut-and-paste on different layers so I could walk through the range of motion, angles, etc. of each design change.
Online hydraulic force calculators helped a lot with calculating cylinder mounting angles, diameters and pressures. I found similar tables and calculators to help with the structural members.
So did I design it? In the sense that I was the one who put all the stolen ideas together, yes. But I can't claim to have created the thing from whole cloth.