I am building a bigger coop and can put in custom size nesting box3s. but i dont think i want to build from scratch. Has anyone used these type of crates? it only has a 9" height, but i cam m9dify it easily to have a tad more head room. http://www.joann.com/stackable-wood-crate/13950290.html Pros or cons of using a crate vs a solid box like structure?