it will be made of plywood with the inside lined with plexi, so i can put the flexwatt between the wood and plexi. i hope to make the cage as energy efficient as possible. i am not sure about vents in the cage. i purchased two vents at lowes. they are 2 inches by 10 inches. i want to put one on each end of the enclosure. but i am not sure if that will be to much ventilation.