I visited my air compressor builder yesterday (should be completed with the compressor next week) and got some good ideas wrt installing the system. I will be hanging my air lines mostly exposed (for the look) and got into a discussion of dissimilar metals. I had planned on using unistrut with their steel pipe hangers. He said that was a no-no as the copper air lines would eventually corrode. He is into the vintage look too and suggested this....
These are hung from a galvanized flange with all-thread.