Sounds like you have a good plan. Here are a few things I spotted.
I don't. Our coop is quite a ways off, so walking to it as much as I'd need to with a brooder would be a task. I built an 8x4 little house that the brooder sits in, then as they grow I'll remove the brooder and they stay in the house. We then have a transitional area with yet another small coop where they can see the flock through 4x2 fencing. Then they move to the flock.
I would advise against the screen on the sides. A chick group can survive a spat of cold weather if say your light goes out, by huddling together. What will kill them quickly is a draft. Any brooder outside would be best to have solid sides.
If you have 30 sexed pullets there, you'll want to consider a few more boxes. There would be a lot of pushing and shoving getting to 6 boxes with 30 hens. Straight run and you should be good.
Sounds like we are kindred spirits. We have a few hives here and absolutley love them. The chickens also play nice as well.
Regenerative gardening, very nice.
Yes - above all this should be your main consideration. Something like a carport always feels secure, but just make sure you account for every scenario. Also consider adding cameras. A predator is not likely to be successful getting into the coop on their first try. This way you'll be able to see what they are trying.
Fox, raptors and coyote will pick free ranging chickens off during the day, everything else wont bother until the night.
Linked below are going to be a great option for feeding if you are concerned with rodents. These ports are absolutely awesome. I used PVC contraptions for a long time and finally settled on 5 gallon buckets and these ports.
YANZI No Waste Chicken Feeder with Rat Stopper Caps,6 Ports and Hole Saw,DIY Poultry Feeder Port Gravity Automatic Fed Kit for Buckets,Barrels,Bins,Troughs
https://a.co/d/4JCQWH9