Here's a set of instructions that include a parts list -
Hoop Coop PDF
As to mine, I don't have nest boxes in them yet - the girls are between 8 & 12 weeks old right now. I've got some baskets I can make into the nesting boxes - but think they are actually going to be too small for these girls. They might lay in the buckets, but they aren't any larger (well they are longer) than the baskets I've got... Here's a pic from Living the country life dot com. and a hoop coop w/ rubber tubs for their nesting boxes (can't remember whose this one is and can't find the link!!) You can go to Pinterest and enter hoop coop and nest boxes and it comes up with all kinds of links/pics! Ductch Hollow's Hoop coop has already been posted - she has some baskets in hers that work well. I'm looking and I could actually use that rectangle on the front of my coop and put a couple of bucket nests there - opposite the "pop-a-top" door.. :)
For roosts, at the moment, I've got some sticks stuck thru corners. They aren't large enough - I plan on getting some 2x4s and using them flat. Should have gotten them this past weekend and didn't. again, what I'm using at the moment is working for now. These are BIG chickens (at 8-12 weeks the larger ones are as big as my mature hatchery stock - Production Reds, EEs and Cuckoo Marans) and I need to do the larger flat roosts soon so they don't damage their "feets" and "toesies".... :) The two pics below was their first day - they truly hadn't even gotten on the "roosts" yet... Tomorrow eve, I will take pics after they get up and set on the "roosts" - tonight I found that there were 6 balanced on each side! Also, not sure how high to make the roosts yet either for these particular birds. They don't "fly" like my others do and I don't want to make them too high.
I also have to finish the feeders and waterers. I found the nipples to do the water and have a blue Lowes bucket for that. The feed is already "stored" in their red feed buckets out in the hoops, but they aren't built yet (red buckets). Need to get the elbows to make the feeders. Also want a 2nd feeder in each pen - that way I can have 50lbs of feed in each coop at one time. The red bucket, in photo below, is holding feed that I dump into a big rubber tub for now in the center of the coop. They eat ok. There are 12 pullets in the Chix Coop and 9 cockerels in the Roo Hoo(p)...
Here is what I want the feeder to look like - only I have a smaller bucket (5 gallon - holds about 25#s of feed at a time). Will look more like 2nd photo... and mine will hang not be on the ground. These images are from BYC/Pinterest...
Last winter, I used larger tarps on these two coops. They wrapped fully around the back and both sides - leaving the front open. For extra warmth, you could put hay/straw bales either on the inside or the outside of your hooped coop. Inside - gives the chickies play/exercise equipment that gets pooped on and broken down eventually. Outside, it weathers. Your choice. We don't get as cold for as prolonged a time as you do, but we did get COLD for us here in NC. The birds were healthy, happy and stayed laying most of the winter.