Okay, so, to be blunt, I suck at building cases/enclosures/boxes/whatever... this will be a short final entry.

Simple, but kind of ugly.  :D

I cut a sheet of 4"x6" acrylic (poorly at that), drilled a couple of holes, threw in a few screws, nuts and standoffs and sandwiched it all together.  Attached at the back is a 2 cell AA battery holder with a bit of VHB double-sided tape.

Functional, but it does leave a lot to be desired in the aesthetics department...