That cage looks great. I have 2 piggies in a 2x3 with a 2x1 upper level, but I also have a small room. I was trying to figure out how I was going to fit a 2x4 in my room with an upper level. But after looking at your design I realize that with a bit of creativity they can live in a 2x4 and still have adequate room. Wonderful cage your piggies have. I'm sure they love it.