it can be little bit hard, but it will be nice if these are be added
clay tower.
you can add weapons,soldiers inside like clay nexus.
and they attack for added weapons.(if you put stick,it will attack close enemys,and if you put gravel, they will do ranged attack)like this.
lastly, if they are empty(like clay tower's HP become zero,they became empty(like empty nexus)and other soldier's can capture it.

sorry for bad english.