I have a manufacturer for a husband and I'm an engineer
That is a dangerous combination. I’m an engineer also and tend to over-design things. But I’m a rough carpenter. I can build a shed but don’t ask me to build furniture or cabinets. You won’t like the result.
CountryMom5, A few things that can be helpful when planning your coop, whichever type you decide on. First, I think these articles should be required reading for anyone designing a coop.
Pat’s Big Ol' Ventilation Page
https://www.backyardchickens.com/web/viewblog.php?id=1642-VENTILATION
Pat’s Big Ol' Mud Page (fixing muddy runs):
https://www.backyardchickens.com/web/viewblog.php?id=1642-fix-a-muddy-run
In Northern Virginia cold is not really that much of an issue for you. They wear a down coat all year round. Heat is going to be much more dangerous for you. I suggest you look at a design that blocks the direct wind from hitting them when they are roosting during the winter but has a lot of permanent ventilation open over their heads. Open up the areas under the roof overhang and cover that with hardware cloth to keep raccoons from climbing in. Roof vents and gable vents help a lot. You get some snow so be careful with ridge vents that can get blocked, but they can help in summer.
During summer, have windows or other vents at roosting level or below that can be opened to get even more ventilation. If your husband wins he can put some real pretty gingerbread shutters on them to keep the rain out. If you win, put them on the side rain normally does not come from. If you have real good ventilation it won’t hurt for it to get a little damp inside, but you do want to keep as much moisture out as you reasonably can. A wet coop is unhealthy and will probably stink.
During the winter they do not want a cold wind hitting them. Mine will go out and forage in zero degree Fahrenheit weather as long as the wind is not blowing. But if a cold wind is blowing they find shelter.
If you are buying the material, a lot of building material comes in 4’ and 8’ dimensions. If you plan your coop around these dimensions you can usually reduce cutting and waste and not spend any more money For example a 8’ x12’ versus a 7’ x 11’. If the material is free and an odd size, don’t worry about this.
I’m a huge proponent of providing more space than you think you need, whether that is in the coop, the run, the roosts, or about anywhere. I find there are less behavioral problems, I have to work less hard, and I have more flexibility to deal with problems if I have extra room as opposed to shoehorning them into a tight space.
Look at your drainage when you decide where to put it. You want where rainwater runoff will not run into it and you want it to drain if it gets wet. This goes for a coop and especially if you build a run. Slope your roof so water goes away somewhere safe, not where it will be a problem.
Good luck with it and welcome to the adventure.