Re: Kids Area
There was actually a recent thread that talked about Kids areas, you should check it out. It's 3 pages long. But to answer your Q's:
1. Yes, we have one, built it last July
2. Unsupervised. It's fairly close to everything so parents can look in on the kids
3. It's been great for us for our Jiu Jitsu aspect; as we have a large Kids class and with that comes a lot of younger siblings. I believe it's helped us with the whole "Family-friendly" type deal. CrossFit, not so much (yet) as most of our CrossFitters don't have kids.