i have become thoroughly paranoid reading the posts here regarding predators. i think rats & snakes are going to be my biggest foes. my wood floor is plywood sitting above the ground about 4" (there is space under it they could live & i have no further access to that area). i've got the coop (inside a hoop house) quite well wrapped w/ hardware cloth. should that take care of it or will they chew directly through the plywood?