I think it's cool. I like seeing what people have done.
Question: are those jerry cans with the water plastic or metal? Do you have to take any precautions with the stored water to keep it clean?
I also have a "batcave" under a flight of stairs, but your staircase must be much larger than mine. Mine's also a closet that I mostly just use to keep all my firearm stuff out of the way, and it sort of developed into a bunker.
After (old pic)
I've since added some more weapons, ammo and mags, as well as three month's food and water, a radio some lanterns and a few other supplies and given it a lick of paint. It's still small, but looks much more organized and spruced up. It's real virtue is that it's practically invisible from the outside.