I think you're going to love it!
Just a thought for you to chew on regarding gsim's concerns about your space.
Your flock's dynamics make all the difference. Previously i had a flock of just 6, all Buff Orpingtons, and they were never ever the least bit aggressive toward each other. I feel certain i could've put them in half the recommended space, and they would never have fought or pecked at each other. I'm not recommending that - peaceful birds still need exercise - but i could have done it without seeing them start to fight or show aggression in any way.
Now, i have a larger flock of rir, buff orps, and barred rocks. The combination of breeds and their different personalities is a completely different dynamic. The buff orps are still sweet and peaceful except when they have to defend themselves against the others. But i could definitely not confine this group in too small a space. I have had pecking issues from the time they were babies. I give them as much space as i can so that they have plenty of room to group in their little cliques and hide from each other when necessary.
I would definitely start small and with know very docile breeds. I would even recommend going with all one breed, but that's not necessarily the only formula for success.
I'm starting to ramble (i just woke up), but it might clarify to say, i would personally not hesitate to put a dozen buff orps in your space right off; but if my breed were barred rocks, i would feel pretty good about half a dozen; and if i chose rir, i wouldn't put more than 4 to start. But every flock is different. I have no doubt that you will be successful with your set up. And i can't wait to see what you come up with.