The first thing I did was modifying the Pibow cases. The cases come packed in a nice paper bag and consist of the following parts:
The idea was to put two cases in top of each other with the bottom side upwards. This because both the USB as the network cables had 90 degree angles plugs that faced upwards when put in a Pi in normal postion…
As pillar bolts were hard to come by locally, I opted for a long threaded M4 rod and some aluminium pipe to stack the PI’s together. In order to be able to feed the rod through the PI’s and casings I had to carefully enlarge the holes from 2,5 mm to 4 mm.
At first I tried tapping thread in the Pibow casing parts. That worked out wel in the clear top and bottom parts but one of the red parts broke into pieces :(. I was able to glue it back together though and you cannot even see the seam 🙂
After some drilling and fitting I ended up with 4 nice looking mini computers! If you look carefully you can see the enlarged holes in the casings.
Raspberry Pi Cluster 