I used the same method as I did for the elbows. I used a set of snap magnets attached to nylon strapping. If you want a sturdier, less bendy, joint just use a thin piece of plastic instead of the nylon strapping. The joints have worked great and have never come apart at a troop. I just unsnap them for travel to save space. Good luck and your build looks great so far! keep up the good work!