Quite of a vast question, but here is basics:
Give the structure a Behavior, set period of the Behavior as you desire, and make and link a Search Effect to periodic effect of the Behavior.
Then make and link a Modify Unit Effect to the Search Effect, setting the amount of healing as you want in vital array.
It should work, although with no vfx/sfx. You have to make actors and stuffs to make it more lively.
Vital Array? What option allows a unit to be healed there? Total Life Healed?