The Charger (Charged Creeper Farm)

I've been working on this after I finished the End restoration project. It's a massive charged creeper farm, 294 cells total, length has 21 cells, width has 14. Dimensions are 100W 149L 14H in blocks. Any lightning strike on its surface will result in a charged creeper. I seem to get 2 - 7 charged creepers per thunder storm from this. Once a creeper is charged it can be dropped into a water stream, after which it gets transported to the 'detonation chamber', close to which I have a nametagged stockpile of zombies, skeletons, and creepers ready to get killed. The entire surface below the farm is lit up with redstone lamps that can all be turned off at the flick of a lever if I need a new creeper to lure into a cell after using a charged creeper. Can also be used as a mob arena though. lol

Imgur album for more pics: imgur.com/a/gIi53