As the title says I'm Re designing cage to go from 2 to 4 piggies. Were hoping to get two more soon but I'm not sure what to do. Right now ours is two levels and they tend to lay around on the top level more where there is less space and don't run around as much. I thought if we could find a design that would be good for 4 and encourage free space running...? Small house but I think 2x6 and a small loft is that a good or just minimum space for 4.