
Without accounting for different claims for the siege claim it seems like even having just one extra wall 100 tiles out makes sieging a base only slightly better than current system (factor in sieges being tied to claims and then it's probably worse).
Also in my picture above, how would you fuel the 2nd ram if the defenders built no walls around it for it to attack or is the idea that you would just immediately have to build the third ram and use that @ a quarter of the auth from the 1st one? You could just keep extending this to make attacking even harder by simply building big buffer gaps.