@poultryprofessor is working on something that also may have some good pointers. Note the post also points to here:
http://www2.ca.uky.edu/agcomm/pubs/ASC/ASC189/ASC189.pdf
Many of the hoop coops are tractor minded ... but that doesn't mean it has to be.
I'll be building my run soon based on...
Hoop coops are probably the most economical. And, if you build something else down the road, the materials can be repurposed towards a run.
@KBNAZ Did a nice job of finding some other ways to get materials. I don't think this will translate to what you want directly, but may give you some...
before you go with vinyl flooring ... read up and consider Black Jack Rubr Coat 57.
https://www.backyardchickens.com/threadloom/search?keywords=black+jack+57&tab=0
Anybody interested in cheap/free wood should also check out this:
https://www.backyardchickens.com/threads/repurposed-box-spring-secondary-coop.1458393/
I'm pretty sure I mentioned that the @Yakisugi Coop was too small for the OP needs.
However, it references a great discussion on ventilation. It points to other coops for ventilation inspiration and discusses the importance of roost height relative to ventilation.
It references the roost...
My first recommendation is to read all about the Yakisugi Coop :
https://www.backyardchickens.com/articles/yakisugi-coop.76398/
This coop write up spells out exactly why every choice was made and will help you decide what you want to do from a big picture perspective as well as for the little...