Yeah, I could in no way either, but it's an option for some people. While it is definitely possible to sex bantams, most hatcheries don't bother since they, and their organs, are so tiny.
While outside the coop time is nice and helps, it doesn't really affect size requirements unless they're out at least six hours a day, every day. Another benefit of bantams is they tend to be friendlier.
All of those have bantam variations. If you want both, in theroy, you could get several bantams and then a couple larger for eggs. But those breeds are fairly homebased, so you can just get all large and fit them in there. Personal preference. I don't have any experience combining bantams and...
Eight square feet would work well enough, but I would get birds that don't mind having less space. Just go for Orpingtons, rather than Minorcas. Bantams would work great, depending on your purpose. If you just want them for show or pets, great. If they're for eggs, go for full sized. While some...
The more space your birds have, the better. There should be at least four square feet in a coop per bird for standard size. As long as they have enough space in the coop, the general rule is ten square feet per bird in a run. In other words, six in the coop, four in the run. That obviously...