First: Chicken wire will not even keep a small dog out. Coyotes, raccoons, ravens, possums and even ground squirrels will go right through chicken wire. Use welded wire. 1x1 or 1x2".
2nd: Outside all the time is not good for babies. I put babies outside for an hour at a time and gradually increase to outside all day once they are around 5-6", but they still sleep inside. I don't move them outside fully imd until they are 8-10" and I make them an insulated, sealed, close able, heated night box. SOmething about the great outdoors in North America does not agree with baby sulcatas. They do much better when started mostly inside for their first few months.