Cenn … first of all a water base is technical a semi-cheat to prevent raiding. I know because i also do it. Land bases ( not talking about rock bases ) can be raided too easily.
Your calculations are also not 100% accurate. Your using the 84 C4 as a calculation to “destroy” your base. Most raiders are not interested to destroy your base but are after your resources. Lets compare shall we:
10500 (Metal Fragments)
1260 (Animal Fat)
1890’ (Minutes) = 31.5 hours to craft. But clans SPLIT there crafting so its 31.5 hours divided by the amount of members.
50 armored cupboards is:
50 * 1000 wood ( cupboard ).
4 Walls + floor + foundation. Assuming they are only build one high:
6 * 50 initial wood
6 * 50 * 200 wood ( armored )
6 * 50 * 200 Metal Fragments ( armored )
6 * 50 * 200 stone ( armored )
That already is:
Wood: 50000 + 300 + 60000 = 110300 wood
Metal Fragments: 60000 Metal Fragments
This does not include the wood need to melt the iron ore + the fat for the smelters etc … So in other words, just in your cupboards defense you already have the same time / resources that the guys need for the 42 C4.
You state 14 walls. That is 14 layers of defense? How many resources go into this? It depends on how many wall segments you have per layer. As each layer gets bigger, we need to assume you have multiple and have them all round your base.
Then the initial base with its upgraded.
The only reason why your base is impenetrable to raiders is because your using a semi-cheat on the water. Build the exact same base on land and i can tell you that your base WILL be raided by any of the clans that have the same amount of members.
The amount of resources you need for a land base is way more then a water base. I build several big bases over time and the water base is the most resource inexpensive bases you can make. Almost no possibility of twig tower raids. Even if a enemy can get by your cupboards defenses, they most of the time can not enter your base even if they blow the outer wall ( the swimming / platform bug ). On a land base blowing that outer wall and they enter without any problem. So no offense but calling your base impenetrable is because you use the games mechanism to the max.
One clan i remember talking in public about this and there fear is that people will simply ALL start building on the water because it was so easy for people to get raided on land.
The moment they do raid you and take half your processed resources, they then can then focus on building more C4 at a very fast rate as they do not even need to bother with resource gathering / melting etc.
The problem is not so much clans bases vs clan raiders in the game because both can gather up the resources at extreme rates. The problem is mostly individual or small groups vs clans.
You can clearly see how small players quit after getting raided by clans and after a while you get nothing but the big clans left and a server filled with empty houses. If it was not for wipes that bring in new players, the servers will become very fast boring and death.