Sorta need to agree. The idea with the NPCs fails because of the technical capabilities of the sever. I have good internet and even I couldn't target the NPCs most of the time, which wasted precious time. Also, the armor was way too much given that they were only shot by bombers.
Just repeat this event with players flying the cruisers. Better yet would be to just straight up make it a PVP event like the ones in California, where the plugin keeps track of kill totals for each side.