It would be much improved with a button or two - one for 'take snapshot' and one for 'start/stop recording', and maybe an indicator light. I know the case is not intended to turn the pi into a standalone camera (otherwise it'd have a battery pack as well), but a couple of buttons would come in very handy...
Also, if there's space (which judging by the 3d printed prototype, there is), a simple viewfinder would be easy to implement - something like a hole straight through, or maybe one with a smallish square hole on one side going to a larger one on the other side with a circle and a crosshair or something like that maybe - so you can look through and make sure it's pointing in the right direction without needing a screen.
*looks back at thread* ah, you've got the camera placement in a 'video camera' type placement, so wouldn't fit with my viewfinder idea. Forget that then
The button might still be nice though.
Just a couple of thoughts.