My son had sent me that video a while back, totally creeped me out. Amazing also, the incredibly stupid cell-photographers.
Back in 1975, I built an O/A manifold system for my high school welding shop using black pipe. Gas pipe, which is galvanized outside only, would have worked also, but you don't want regular galvanized pipe as the zinc can flake off.
The local welding supply had a guy from the home office who helped me through the entire process. The fuel tanks were outside, I had a hydraulic flashback arrestor for acetylene right inside the wall where the fuel came in, and check valves at each regulator, both fuel and OX.
After trial assembly, and before ever attaching ANY tanks, ALL PIPE AND FITTINGS WERE SENT OUT TO BE PICKLED, EVERY PIECE, to remove traces of oil from manufacturing, as well as traces of soap which can contain oils.
I cannot emphasize the above statement enough.
I would start with my local WS by asking them for a tech advisor from the home office.