How do you make a frame? I know how to do an arc blast type frame. But what about internal ones. I get that you set up retaining pockets internally but I don’t understand: (1) how it connects to waist belt to transfer weight to hip (2) what you do to connect two side stays at the top. Delrin loop, yes okay, but how do you actually make/bend such a thing? (3). If you have fitted internal loops against inside of rear facing panel to hold the stays, how do you fit foam or hdpe between the stays and rear panel? pics welcome. And comments on weight transfer/comfort success.