Summary

Ultra minimal base frame for the new Raspberry Pi Model A+ (a plus)

Basic frame that protects the side and undersides of the pi,
while remaining relatively bare.

Editable CAD model is available on tinkercad:

https://tinkercad.com/things/hnPJTpfrpRi-minimal-case-for-raspberry-pi-model-a

I've also made a version for the b+ here:

http://www.thingiverse.com/thing:552938