I've been eyeing these on West Elm lately, currently on sale for 49.00/pair. They're linen, 96" long. Also on sale Plus a bunch of others, including patterned or solid, e.g. burlap. I can't quite make out your colors (more beige, greige, or gray?)

Wood closet dowling. I think it might come in a 2"diameter, and up to 10'-12' in length. It's sold by the foot at Home Depot or Lowe's. I've used it several times for heavier draperies which were lined ans quite wide, and it worked like a charm. It's much cheaper than an extra large store bought rod. You will also need to buy brackets for the ends as well as one in the middle. I use wood ones which are sold in the drapery hardware department. You can also paint or stain your rods/brackets, moreso the brackets since they will show.

14' door or did you mean 72" door here? A 14' door is pretty large.

Hi! I’m trying to hang 6 linen panels across my living room windows. I need a heavy duty curtain rod that extends to 172 inches. Any suggestions? I’m nervous the rod will sag if I go with a basic one, but also don’t want to spend an arm and a leg (over $400) on a custom rod. Thanks in advance.