RigidBot controller board (RigidBoard) side mount housing

Photos of finished build here: http://www.thingiverse.com/make:205396

Enclosure for the RigidBot original controller board (RigidBoard).
This differs from the original housing in that:
1. It is vastly better ventilated - no fan needed.
2. There is no risk of filament pieces or knocked-off prints hitting the board.

This enclosure is meant to be mounted vertically in one of the outside corners - upper left rear (version 3) or lower left rear (version 4) is recommended, but other places mi