I think that would work great! I don't know about how much room littles need at different stages, but they should be fully integrated before they get to cramped.
I plan on sectioning off the area under my poop boards, I'm going to frame it and put-up hardware cloth with little pop doors for the littles to run in and out. What's the inside of your coop look like? I bet we could help you come up with something ;)
I'm in Texas and in the same boat, no cold until this week and I already wish it would go away, lol...They "say" we are going to have a mild winter, but after that business this last February I'm not picking up what they're putting down :lau We'll just have to keep each other posted when we get...
I was going to wait too, but my neighbor went in on the order so it's a total of 15 chicks and they'll throw in a heat pack if the weather is crap, hoping it's not :fl And ya a surprise breed does seem exciting, I love a variety of breeds and egg colors