So...I thought I was all done after building my chicken "run". Ive already heard way too many bad raccoon stories and such. I need to put a small/medium box in there to put the chickens in at night. What size box can I use for 4 silkies. I inclued a picture of the now painted box I have for right now. The dimensions are 24" deep by 14" tall by 30" long. Please give any and all suggestions. I need as cheap as possible!!!