Many of the "industrial" reclaimed wood tables I see here or on line have legs and supports made of 1" iron pipe and fittings. Threaded to length and simply screwed together. For a ceiling mount curtain rod in industrial style 12'6" long you would need three floor flanges, three 4" +/- nipples, 2 90 deg. elbows, 1 tee and two cut and threaded pipes at 6'2" Screw the nipples into the 90's and the tee, spin the pipe into the tee from each end, spin the 90's onto the ends of the pipe, spin the floor flanges onto the nipples. Mark out the ceiling for the floor flange holes. Install drywall anchors...I like the plastic or aluminum ones that look like weird hollow screws, they're tough. Put the rod back up and install the screws into the drywall anchors. Hang curtains on big metal rings. Curtain or rings can go on as part of assembly or be figured out as an add on..not my forte, the curtain thing.

I don't think there are floor flanges for copper pipe. Mounting the pipe might be an issue. Shelves and tables made with copper pipe and fittings are rampant in Martha Stewart...how I know this is a long story and has more to do with clients than I care to admit.