Fantastic writeup on TH9 base design.
Everyone in Supreme Cream at TH9 or who is about to move up should read the linked info above and start working on improving your TH9 layout, and then continue to improve your layout based on war results.
For non-CoC players, the above is just a small glimpse into why CoC is far deeper and more difficult/complex than it seems at first glance. The game really is a monster of a strategy title, and as soon as you think you have it figured out or are getting decent at it, you either move up and have to learn a bunch of new stuff, or you have a war like we are having right now and realize you have a LONG way to go to be more than a pub-stomper player/clan.
Easy to play, hard to master is an old game design mantra, and CoC is a prime example of it done perfectly.
Hardcore Casual 
Very useful information. Have you found a better base designer than what is built in?
http://www.clashofclans-tools.com/Layout-Builder
Thanks for posting – this is a good read.
One note from the guide – for those of us thinking about what to research at TH9:
At TH9, LaLoon is pretty much unstoppable (SC plz nerf). Nevertheless, there are things you can do to make it harder on attackers, which I share below.
I think that assumes your LaLoon is lvled up, which takes time with the Lava Hounds.
Can you get lava hounds at th9?
Yes.