Ideas for make-shift enclosure

I've had to separate one of my piggies from the others for medical reasons. He isn't infectuous, I just need to monitor his food intake and poop very closely for a few days. Anyway, for logistical/space reasons I couldn't keep him in the same room as the others, and now he's miserable and lonely, which clearly won't help his recovery. So I want to build a make-shift enclosure next to _his_ make-shift enclosure so I can put a friend next to him. But I've used up all the cage-elements, and I won't be able to buy anything until after the weekend.

So, any ideas for how to build a make-shift cage? I'm a normal person who has normal things lol. I do have all sorts of tools, but I'd prefer this not to turn into a giant building project because it really only is for a few days. I'm also okay for this to be not quite up to the recommended dimensions, because again, it's not forever.