There is typically a couple inches of space between the top drawer and countertop that would work well for hidden storage. One could even put a thin piece of wood cover up there to conceal further - maybe even get away with a gun and ammo. But I think your point on leaving a weapon is a good one.

False bottoms, backs, tops, floors would all make good hiding places. Maybe a PVC pipe made to look like a sewage stack, but stocked full of goodies. Behind photos and inside ductwork is usually okay too.

One other thing, if you leave the door open, I think it would be a good idea to have an automatic door closer so the critters don't come in after the burglers and poop on your parade.

Any other ideas?