the original was a clipped together plastic housing with 2 small vent holes near heatsinks, the circuit board was just placed on the bottom housing part on plastic locating pins, thinking on version 3 and mains safety next, but for now I need lights on and in the version 3 I think I will run the relay and the 8 drivers together but remove the pi, the 5v supply, the 12v supply to its own little housing close by, this way I will get more room and more robust mains electrical connections into the boxSo, the original enclosure was using edge mounts then.