Anti-3 Star Base Characteristics
The base has a 4-7-5 ratio (4 tile Second layer, 7 tile third layer and 5 tile junk layer). when it comes to section making. More explained within the Meta-base page.
CC located: 1-2nd tile. At the very center, ranges from 1-2 because of the offside side of the 3x3 building.
First Wall: 2-4th tile. In order to create the second layer.
Air Defense/Double Giant Bomb: 4-8th tile. Best coverage location and it balances out the base.
Second Wall: 8-9th tile. Serves to close off the second layer of the base.
Third Wall: 14-16th tile.
Point Defense: 13-15th tile. (+ loose building). Most point defenses have to be located around this section due to the clan castle being a 12-tile radius building. Loose buildings are the extra 1-2 point defenses that could be put at different locations after already making the CC unlurable.
The Queen Also falls under the Stationed Building section but that'll be explained more in the [20 Grid - Queen] page.
Some walls of courses.
Xbow: 4-8th tile. It is usually with the AD to form a pair so that double giant bomb could be placed inside. Can be moved alittle further out, or placed beside the CC.
Wizard Tower: 8-15th tile. Can be placed mostly anywhere to assist the point defenses.
: Irrelevant: Mortar, Town Hall, and Teslas Mortars count as point defense fillers, Town Halls in Meta-bases are counted as 'storages' or as a filler as well, and Teslas I always find is the key variable. They can be moved anywhere on the map, to prove it's worth and doesn't really make a big impact alone, but does contribute to strengthening other buildings.
Almost ALL meta bases I've seen follow these characteristics in some sections or another because of the fact that the buildings located within this location provide the best coverage. Move any of the buildings/structures out of the 'zone' of which isn't indicate can actually change the dynamic of the base.. Flexibles/irrelevant buildings can be placed at different locations which give the base it's own qualities. Does this mean if you put all of these set ups for the characteristics around all 4 direction, your base would be unbeatable? NO. It's combines other factors such as queen position, section protection and asymmetrical base in order to make it harder to path troops.
You may not believe what I say about these characteristics, but if you examine all the current meta bases/the two examples below, you can see the ratio/characteristics are present.
Example 1: Metaki Series #3
Example 2: Project Eclipse #1
What anti-3 star bases offer is the ability to 'absorb' troops into each section, while dealing with the troops
With this characteristic in mind, the weakness of most meta-bases as of right now is that they are really sectionally made, but if you break down these sections with lavaloon, they are very brittle due to not containing more layers of defenses. Check out this [Weakness of Current Metabases] for more information.