Lady Amhurst are pheasants. It's one of these fevers. You start with one type bird and the fever spreads. Pretty soon you have all kinds. That's why you always need to think bigger when you are building.
An 8 X 8 is a nice size and will give room if you want to add a few more chickens. 2 sq ft per chicken is the rule for housing adults. But remember if you build roosts and stuff that also adds square feet going up. This works if they have plenty of outside room to run as well. My chickens only use their houses for laying, sleeping, occasional shade, and winter weather. They all prefer to be outside and it also helps the feed bill. As far as the run goes, make it as big as you can. More space means less maintenance and better health for your birds.
Ivywoods,
I have purchased about $300 worth of automatic watering system parts to go in my new building. I'm working on a large feed system but haven't figured it out yet. I'd like to feed from a central location. Don't want to spend more money though. And that would be great but I have extra pens of special chickens that have their own little houses and pens. Then I have 3 kinds of ducks, and guineas and now 3 kinds of pheasant that all have pens elsewhere. I can't fit them all into one central area because they have different needs and different atmospheres.
I guess I have shot myself in the foot, and I occasionally think of downsizing. Then I see something else I just have to have. So I guess until I can't pay to feed them any more I'll probably continue to have more projects.