We had to make a new pen for Cookie because she was originally put in a pen that was supposed to be temporary.  Once we saw that she would not be a good fit with the other girls at night, we knew we had to do something else for her. So, Hubby made her a new pen for night time.

He used some pool panel that we had here and welded it together. In some spots he was able to bolt it, but the majority of it had to be welded. For the gate, he had to come up with a latch to keep it shut. He idea was ingenious, I think.

There was already a part on the door that would go around the other pole on the next panel. We just needed a way to lock it at night. So Hubby bolted on a slide. You slide the part up, shut the gate, and push it down to cover the bar. It works beautifully.