PiDP-11 stable case extension

The PiDP-11 in itself is great, but I felt the stand (and its stability) could do better. Plus there is very little room for cables and connectors without an extension to the case. So I designed my own, and since I had to split it in parts anyway to fit on my printer bed, I ended up with colours matching the PDP-11/70.

The original rear cover will fit this case extension perfectly, so the new rear cover included here is optional.

Four M3 bolts and nuts are needed to attach the rear cover (original or new) to the case extension.

**UPDATE**
I have added a second version (V2) of the upper parts, with the top sloping back in line with the PiDP-11 case, instead of being horizontal. The original rear cover won't fit V2, so you will need V2 of the 3D printed rear cover.