I would like friendly birds with large egg production. Cant move the nest box so I probably will raise the roost. Should I put plastic under the gravel or sand to prevent weeds or will the chickens take care or the weeding? Good idea on a screen door thank you. Do you not think the windows are enough?
It would be a lot easier to raise the roost bar. A foot or so should do it(Hopefully). As Shan30 posted, you don't have to put any plastic down, the chickens will clear the run area out. Plastic would just get shredded and be a headache.
Are you gonna let them out to run around, or do you plan on keeping them in the cage? They really like to get out and stretch their legs. You could let them out a couple hours before sundown and watch them. You could always expand the run. I have a 100X200' "run" enclosed with electrified poultry net. They have all kinds of running room, and are safe from ground predators.
As far as friendly birds go, Buffs are good, I got three of them. I have a couple of Barred rocks, out of the 5 I have, that are the friendliest chickens I got. Gold and silver laced wyandottes are good birds too. Easter eggers are really good layers, and friendly enough. They put out the biggest eggs I get. Bottom line, they are all friendly when you bring them some kind of treat food, just about whatever it is.
As far as the screen door goes, really, the more fresh air and light you can get into the coop the better. That's what you want, light, airy coop that doesn't stink. As opposed to dank and stale, with a nose burning stink.
Another thing, paint the inside white. It reflects light, and really brightens the coop up. I used a Porch+ deck exterior paint from Lowes. Makes it easier to spot things in the coop that should not be in there, like spiders, bugs or whatever.