I think any of those three coops would work for you, but the first would be the easiest for you to build yourself. That one looks to have a feature that it doesn't highlight, and that I am going to use on my next coop, and that is an open top to the coop covered in hardware cloth, beneath an elevated, floating roof. That would ensure that you have adequate ventilation for your climate, since it would vent heat during summer, and during winter you could slide in flat partial or full panels over the top of the coop and beneath the roof structure to reduce any drafts while keeping it adequately ventilated. The boxy nature of the design is easy to envision and remember during construction.
If you want to build one yourself, you can break the design and construction into discrete tasks:
1. Use dimensions for the sides, bottom, and top that are multiples of 2, 3, or 4 which are the heights of the hardware cloth you will use. That way you just have to cut lengths and not widths too. With this design, I would use a run height beneath the coop of two feet and continue this around the run. I would use four foot sections above this in the run to give you a six foot total height, so you only need 2-foot and 4-foot hardware cloth.
2. Start with four posts for your coop base made from 4 X 4s. Four two-foot posts allow you to cut them from an 8-foot 4 X 4 with no waste. You can frame these with 2 x 4s to the outside coop dimension.
3. Level the base.
4. Put a plywood base on top of the base and attach 2-foot hardware cloth around 3 sides, leaving one side open to the attached run.
5. Make framing out of 2 x 4s for the four sides, leaving openings for and access door, windows, nesting boxes, a chicken door, or anything else you want. The framing would be four foot tall. Attach the sides to the base and each other at the corners. The top should be flat and will give you a height of six feet.
6. Put plywood or T111 siding or something similar on the sides. Cut out openings as needed. Paint as desired.
7. Put hardware cloth on the top to completely enclose the coop.
8. Make the frame for the run out of 2 x 4s for the dimensions the city will allow. Like the coop, it should be six feet tall and flat on top. The bottom should be pressure treated where it will be in ground contact.
9. Frame in a door where you want one.
10. Paint the frame if desired and install hardware cloth over the top and sides of the box using the same two sizes you used for the coop.
11. You can build a door for the opening out of 2 X 4s or 2 x 2s and cover with hardware cloth. Install using at least two hinges to the frame you've installed.
12. At this point you have an elongated box with a flat top that is covered in hardware cloth. The roof can be made separately to slide over the top. Make it the same width at the total coop and run, but longer to hang over the front and back. Make one side taller than the other to shed water and snow using joists that form a triangle. Space these at 2-foot intervals so you can attach 2 x 8 foot roof panels to them and build a frame with them. Note that if you have a 4 X 6 coop, you can use the panels without cutting and they will overhang by a foot front and back without cutting. Attach the panels to the frame.
13. You will probably need help for two people to put the frame up against the structure and lift one edge to slide it up on top. Adjust it so it covers the coop and run.
14. Voila! You have made your own coop of your own design!
I find with these kinds of projects, it helps to think of it in small, discrete steps. That takes something daunting and makes it doable. And remember, it is just a chicken coop, not the Taj Mahal, so if it isn't perfect, the chickens don't care at all.
Best of luck with whatever you decide to do. And keep us posted!