How about a hoop coop? They're the simplest build for people with limited handyman skills.
If you've got predator issues a PVC-framed coop is not going to be a good option. They're lightweight enough to be flipped by an animal or by the wind and the flexible plastic can be deformed by a predator that is strong enough or heavy enough.
Alternately, since you're concerned about wood in your climate, how about making a coop from a chainlink dog kennel reinforced with hardware cloth to keep smaller predators out?
In your climate an Open Air style coop without an enclosed section really would be healthier for your birds and either a cattle-panel hoop coop or a dog kennel coop would be sturdier and more predator-resistant than any PVC construction could possibly be.