Hi everyone, I put together this nesting box out of scraps I had around. In hindsight it looks kind of small. Measurments are 12"x12" 10" in the front 12" in the back. my girls will be laying in about a month so they've no experience with nesting boxes. What do yoy guys think? Is it big enough? I have 2 brown leghorns, 3 delawares, 2 RIR and 1 barred.... about 4 month old.