Okay to the original post. There is really no way to "Rat proof" a coop. If them litte buggers want in they will get in. You can put wire..vent covers.. up but it will not stop them Rats can chew have been known to chew threw plate steel. But as far as them really going after your birds...
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Pine Shaving are easier to compost and better for deep littering Straw/hay is not the best. same for using straw in the nesting box. Yes a "block" of shaving cost more then a bail of straw. But at least every time you up in new shavings the coop smells better.. even just for the day LOL.