Storage box for 2015 short bed?

After coveting them for a long time, I'm finally the proud owner of a new Tacoma (2015 PreRunner, double cab, 5' bed)! I'm looking into additions/modifications to make it my own, and I like the idea of a locking storage box for the bed. Since there's so little bed space already, I'm not sure what route to take. Also, I'm pretty wary of drilling holes in my brand new truck, so options that mount without that are preferred (this may be impossible, though).

I like the look of the Geneva Side Bed III, but there's no room in front of the wheel wells, so that's a no-go. I've seen the UnderCover Swing Case, which looks pretty good and would allow access to the small built-in storage spaces on the side, but it might be too flimsy/vulnerable. Any sturdy suggestions that would fit a short bed would be appreciated.

 

There will soon be a lockable toolbox that integrates with this: http://www.tacomaworld.com/forum/2n...-side-rail-height-cargo-basket-kb-voodoo.html

 

That looks pretty nice! I looked into your other stuff as well, liking what I see. I'm definitely looking for something space efficient and removable.

I wish there was a way to expand the existing side storage, there's clearly a lot of unused space there, but the only option I've seen costs $200 each. $400 to barely double that small space is absurd!