In a pinch this weekend I had to create a new cage for Charlie. I used a small utility shelf unit, a drill, and zip ties.
It layered it with a puppy pad, towels and fleece.
Just wanted to say - I know this is too small for one piggy. I built it in an emergency type situation when weekend plans were changed due to inclement weather.
He was supposed to be in a 2x3 using a shower curtain. This worked with the space we had available and was up off the floor which was a must.