I was wondering if my Run design sounds secure enough? I am building a 8x6 4 foot high run using 2 by 4rs and 1 inch welded wire fencing on all sides and top. I will have a latching/locking lid and door. I was going to use chicken wire but that just looks too flimsy I live in a very rural area and we have racoons/foxes/coyotes/dogs/opossums/eagles you name it we got it. Also, at 9 weeks old is it ok to leave them outside(in coop) with nightime temps no lower than about 48 F.?