What do you guys think of this base

Im planning on rebuilding my th7 to better protect my dark elixir and center my clan castle more

http://clashofclansbuilder.com/plan/25800

Open up the top right corner (and bottom left if you have enough walls) and place a builder's hut inside. It will attract wall breakers until the builder's hut is destroyed.

I think you should switch the cc with your de storage, cc should be at the very centre so it is very hard to be lured.
As for your 5 th cannon, you could use those 6 walls near the wt and mortars to create a compartment for your 5th cannon on either side. Other than that it looks good, though it would be nice if you had placed all the other buildings around it as well.

Also this is the base I'm currently using and doing great with it. The only problem is I can seem to relocate the DE storage and CC more to the center without making other defenses vulnerable.

http://clashofclansbuilder.com/plan/19319