I thought you might be.Thank you! We were thinking something like this.
That style is essentially a copy of many of the prefab/flatpack coops I see for sale.
For example:
https://coopsandhutches.co.uk/produ...MIvpuwrqXe_wIVAuTtCh09kARdEAQYAiABEgKIhfD_BwE
It's a very popular style. It does in my view have many problems and is built with cost in mind and to look as aesthetically pleasing as such coops can.
They work. I took a very similar flat pack coop to bits after ten years misuse and abuse.
https://www.backyardchickens.com/articles/flat-pack-coop-takedown-and-appraisal.78406/
The long term problems become evident when one has to deal with hygine and parasite infestation. They are reasonably secure from foxes, rodents, weasels etc. I wouldn't want to test one out with a determined dog, or marsupials, or a bobcat.
The flatpack versions of these coops are very poorly viewed here on BYC and then people go and build one of almost exactly the same style, with all the same drawbacks, but larger and hopefully better construction.

An arrangement like this gives the best security in a yard. There are three barriers before a predator can access the coop; the yard fence, the run fence and the coop itself.
If one is building rather than buying then the coop in the middled can act as support for the mesh/roofing that covers the run. A very strong roof can be constructed in this manner.
The coop needs to be off the ground, 3 feet is a good starting height. Mesh the underside of the coop itself.
There are other options.
This is what I'm currently working with. It too has disadvantages, but with regard to coop hygine and coop security it's very hard to beat.
There is ample coop room for five which is the number of chickens you're thinking of.
Better still is the coop being offered in this competition.
https://www.backyardchickens.com/threads/nestera-coop-giveaway-total-worth-1595.1584415/
It wouldn't take much imagination to build a secure run around such a coop and one might avoid after ten years use the terrible state of the flatpack coop I linked to in my article.
Extreme security solutions if one has the space. Should one build a coop and run in the style shown in the diagram above and have a non house pet dog, the dog with a kennel can be placed in the run surounding the coop overnight.
These are all suggestions which may not be suitable for the amount of room you have, the money you are prepared to put in, your aesthetic considerations etc.
What I've tried to do is to encourage you to think outside the box rather than copy more or less, what many others have done. Just because something is popular doesn't make it the best option.
Whatever you do I would urge you not to use either planks or tongue and groove in the build; use sheet material such as half inch plywood preferably marine ply given your environment and double skin any openings in the coop with a heavyweight weldmesh and then hardware cloth. The same for the run fence.
Good luck with your chicken journey.
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