I posted this on another site and thought I would share parts of it with you guys.... My Ig is only 3-4 yrs old and is 5 feet long already! My cage is made of 4 sliding glass house doors. We attatched the doors together standing up in a stop sign shape and hinged them together. The door of the cage is made of galvanized wire covered by a blanket and it is the same size of the sliding glass doors. The 'roof' is covered in the same wire with plywood over the top of that to hold in the heat and humidity better. The floor is made of plywood with Linolium covering it. The lin goes up the sides of the door bottoms (about 2 inches) to hold in any mess that he makes in case he misses the potty lol We have 2 shelves, one mid level and one higher up for him to sleep and bask on. His lights hang from the top wire on the 'roof'. The best part about this cage? All the glass doors we got for free just by spreading the word that we were looking for them for an Ig cage!! We have since recieved 6 more glass doors and will expand his cage soon.