I have 2 separate air lines. 1 in copper I ran years ago, and the newest (about 10 yrs old) I did in black iron. I have ball valves at the drops to eliminate moisture, and a good dryer in line, I also use a good regulator and dryer right before my spray gun. I have never had moisture problems. I did see someone did something similar to the OP but instead of all of the loops ran a couple of copper baseboard heat lines with the fins, I thought that was a pretty good idea as well. My electrician has told me that any plastic piping he gets is priced on the day he buys it because it is so volatile right now, so copper may not be out of line price wise.
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