This playground was our second attempt working with such complex geometric intersections of round pipe. In an effort to make things easier for the shop (more profitable) we developed an application to create a tab-and-slot system to align the pipes at their intersections. This allowed the fitter to very quickly locate and align the parts and tack them in place prior to checking alignment. The shop crew were much happier this time around!
See the tab-and-notch system closer here … https://youtu.be/PSRJD6vVXb8