PVE NPCs target tool cupboards (Rust)

Hi, 

Looking for a PVE plugin where NPC's try and destroy any tool cupboards (TC) on the map at random intervals

For example:
Once TC is built, you have 1 day before the first raid.
Would just be murderers / melee armed only at the start. 
Raid starts on a random timer after at least 1 auth'd user on that TC spawns in (maybe between 15-30mins after spawn)

As failed raids mount up, harder npc's rock up. Blue scientists, then green, then patrol heli for a few mins.

Not sure where to start coding myself, so mainly looking for pointers. 

Thanks for any pointers.