Thanks! My pigs love living here, and now it is even better, as they all get along, so there is no divider on the top, and another ramp from the 2 x 3.
That is a cardboard tube! It is larger than your usual kitchen-roll tube, and stronger too! I have a great supply from work - where they would otherwise be thrown away. I now sit it in a small glass 'tub' (the type you can get yummy gooey puds in) - because somebody liked to pee at the bottom - then sit and watch as it soaked up into the tube!