I think there should be a set limit on how many stackable walls you can put up to defend your flag. I feel that at some point wall stacking with too many objects or walls ruins the mechanic of raiding. I also think it would lead to better base designs and layouts since you can't make a 3x3 and a flag stacked with a bunch of walls or something along those lines. You might have to come up with a better base design to offer more protection.
I daresay we all catch ebola when we see something like that. Now, for sure it is raidable with 12 wood charges and