Below is the cage bank I made for my boys. Each level is 120cm long x 60cm deep, big enough for 2 male guinea pigs. The third level of the bank is where my fostered male guinea pigs live from ACS Lakes located in Camira, QLD. The foster pigs stay with me until they are adopted.                                                                                                                              This cage bank is easy to construct. I bought a 4 tier shelving unit from Bunnings Warehouse and zip tied small bird aviary mesh all the way around. The doors are made from Garden Grids which are also available from Bunnings Warehouse. The base of each level is Corflute with wood shavings added, nice and soft for their little feet. This type of housing is snake and predator proof.  The boys love it and it's quick and easy to clean!