Where in the world do you live?  Different coop style are best for different locations determined largely by your weather.  
The triangle style coops can be hard to access and clean, which may not be too much of a problem for a handful of eggers, but can be much more of an issue for meat birds like CX.  For a fixed installation for growing CX (covered run), I'd recommend no less than 5 sq feet per chicken - this allows you to have enough litter so you can turn it and you have space to get in there and tend to the birds.  
The red rangers will act more like eggers than CX, but with a larger appetite.  Therefore they will need egger-type space requirements, and how long you plan to grow them out before processing will play into that.  Egger type space requirement on here are a minimum of 15 square feet of floor space per chicken (including both in the coop and in the run) else you run into issues of bullying and feather picking especially once they're bigger.  For the red rangers, you'll have a mixed flock of males and females and grow them to at least 5 months (I'm assuming), so space is especially important to allow roos to coexist in the presence of females especially.
If I were you, if snow is not an issue/concern, I'd look at greenhouse frame chicken coops that are covered by hardware cloth with a large hardware cloth apron, covered by a tarp.  If snow is a concern, check out cattle panel or similar coops - two cattle panels bend into a C shape, secured at the base, covered entirely by hardware cloth, hardware cloth apron, with a tarp over top to keep out rain/snow.  In either case, you build the ends of the coop and put door(s) in the ends.  
Much easier IMO than a wooden A frame coop, easier for humans to access and clean, among other benefits.