With chinchillas you have to be very careful which materials you use as they like to chew on whatever they can get their teeth on! This means no pressure treated lumber, woods like cedar that contain harmful oils or plastics of any kind. I chose pine lumber, 1/8" luan or plywood, and 1" chicken wire. I wanted to get the more rigid 3/4" or smaller wire, but since I was trying to make this as cost effective as possible, I went with the less expensive wire. It still keeps him contained, but is just a little more flimsy. The 2x2's were cut to the lengths I show in the picture. One 96" board was cut to 4 - 16" pieces and 1 - 28" piece, the 2nd was cut to 4 - 24" pieces and the third was cut to 3 - 28" pieces. The 1x6 was cut to various lengths for shelves and floors and the luan was cut to fit the dimensions of the existing cage which was 19" x 31".