For some reason I thought I read that the opening of this style coop should face south unless there is a continuing prevailing wind?
I guess I better read the book again

It can face south, southeast, the idea is to get maximum sunlight into the coop. Point it, so that happens.
I will most likely start building mine in the next 2-3 weeks.
What was the name of the black roofing stuff use for the floor?
Blackjack #57
Any other last minute tips for a new builder? Or anything you would have done a little different? Like with the windows, doors or roofing?
Just built it tight, no unwanted gaps. As far as what I would have done differently? Nothing, to me, it's a perfect coop.
I plan on using 2x4's for the decking for the floor and that roofing tar/paint stuff on top of that. Also I will paint the whole inside white. I was thinking maybe the metal roofing instead of shingles? I am still undecided in using the textured/fake plywood siding or hardie board.
Are you using 2X4"s as the decking, or as floor joists? I went with 2X8"s, with 3/4" plywood decking in mine. 2X4"s as floor joists, sounds a bit weak to me, if you intend to walk around in there. I used Smartside siding on my coop, it's proven to be good stuff.
I am also going to build it in a way that if I ever wanted to move it I could fab up some wheels to be able to move it a short distance. Meaning putting the framing on cement blocks and not sinking any posts in the ground.
That's the way my coop is set up. If I want, I can hook my tractor up to it, and drag it to where ever I want.