This is my experience, which is similar to Buckeye Sue's.
I just sent these items a week ago, so I was hesitant to post about it until I heard back from my contact.
I found several "bungee type" clotheslines. I got one at ***'s Sporting Goods - Coghlans Pegless Bungee Clothesline #0433 and the other at CVS. The one at ***'s has a carbiner type hook on each end. They extend around 8 foot each. I figured my contact could hook one side of the bungee on each side of the bunk area as a type of "curtain rod". I found a very inexpensive cloth shower curtain and plastic hooks that I figured he could feed on the bungee as a curtain. It seems like it will work. You could probably make it even longer if you could hook a couple more bungees together...just a thought.
Just heard from my contact today. Everything worked beautifully, and they were VERY pleased. I can't wait to see the pictures! 