Enclosure for Mosfet Module

After the relay controlling the heated build platform on my C-Bot burned out, I picked up one of these mosfet modules from Ebay:
http://www.ebay.com/itm/272337397227
Even though according to their specs the passive cooling should be enough based on my amperage, I built this enclosure allowing me to bolt a 40mm fan to the back, plus keep inquisitive fingers out. The above pic shows the three versions I went through to get to the final design. Prototyping is fun!