Because Bargain Fittings was not known at the time 7-2008, a lot of the fist electric rigs out there were using CPVC and such. Since then E-rigs have evolved a lot, as you have witnessed here on HBT alone. I have used the BF nuts, but right now I prefer SS half couplers as they are more cost effective and provide a smaller dia. footprint (able to mount elements lower when doing a side install)
The LocLine is easy to assemble until you get to the threaded adapter, that is difficult. I boiled mine, used oven mits, and smashed them together, or you can buy the tool that McMaster sells.
Just picked up some 304 SS square tube today for $35 per 20' length... cutting and TIG welding that next week for another build...