This is where my trio lives. The box is 120x70 cm and I built it from shelves, adding net to the openings and vinyl carpet to the floot to make it waterproof. There is an opening to a little "yard" where they like to play in the hay. The yard is a big IKEA storage box. They haven't jumped out of it yet
. The whole thing is on wheels so it's easy to move out for cleaning. Whenever I'm home I put another stick-bridge-thing from they haybox to the floor where I have a large dropcloth covered with fleece for them to run around on. I bought cardboard tubes from the DIY store meant to use for casting concrete, sawed them in half and made fantastic tunnels. They love them almost as mush as their piggy crash pads!
And that's Martha on her way out to get some hay!