Hey, I was a couch potato for most of my adult life, but I build a coop when I was 56 years old, and then a second one this year (now 57). I have also commissioned a coop from a builder I would recommend, and have purchased coop kits, as well as transforming a plastic Little Tike's playhouse into a small coop. Of all those methods, I heartily recommend getting the Building Coops for Dummies book here in the BYC store - it's REALLY good. I didn't use it because it wasn't out when I was building mine..... wish it had been!
Depending on how many chickens you want to get, there is a coop that can support as few as 4 and as many as 30 in that book. And the plans are detailed and there are chapters 'splaining everything.
I've seen that particular CL post for over a year now, and while it's a good size and well-constructed, it's a lot of money plus what's he charging to transport it that far south???