Hi Martin and Deborah, and a big welcome to the Forum, its good to have some more overseas members.
It's always very exciting to get new birds, and I'm sure you'll have a wonderful time with them, and lots of eggs.
I do feel, however, that you are planning rather a lot of birds for the run space available. Your run equates to about 14 square yards, which I suppose is around 13 square metres. We recommend that each bird has a minimum of 2 sq. metres of run space each, especially if you plan to keep a cockerel. (Hens will lay just as well without a cockerel, if you don't intend to breed from them.) That would mean about 5 hens and 1 cockerel, rather than the 10 birds you mention. If you overcrowd poultry, you will get a lot of problems, such as feather-pecking and bullying, which lead to stress and probably to injury - chickens can be really nasty to weaker members of the flock if there isn't enough space for them to spread out and get away. The low level of the run will make it difficult for you to catch the birds, because you would have to crawl in to them, also this will not be nice if kneeling in poo.
You will in any case need to get in there every day to poo pick, as 10 chickens will make an enormous amount of muck and if not kept clean it will soon become a smelly morass. The pine shavings should help to make it easy to pick up the poo daily, if you can get in there! One idea which has worked well for me for some years is to line the floor with permeable landscape fabric, well pegged down, all over, and then put bedding on top. The chickens can scratch in the bedding but can't scratch mud into it from below, which keeps it cleaner for longer. I agree with Chris that low runs are very hard on the back, as well as difficult to keep clean.
One thing my hens like is to hang out together on a long perch where they can see out and watch what's happening in the garden, but with a low run this might not be possible.
The nestboxes are lovely, and they will have plenty of choice. You actually only need one nestbox for every 4 hens, and may well find they only use one or two of them - they are very funny about where they choose to lay.
What predators do you get on Virginia? Here in the UK we have to be very careful to ensure that foxes can't dig their way in under the edges of runs, and from the pics you posted it looks as if you have used chicken wire rather than weldmesh. Many predators here can bite through chicken wire as it's not very strong. It's just devastating when you find your flock has been attacked, so I hope it never happens to you.
Anyway, we will look forward to more news as you get ready for the new birds!