Lid currently doesn't have a proper locking mechanism, but still suitable if it's not getting knocked around much. An .F3D has been included to make fixes with, such as to make it shorter (as pictured).

There are two holes at the side to feed wires through, a gap at the back for a micro usb cable.

There's a gap at the front for sensors, such as a light sensor. 

An example of a mini breadboard is: https://core-electronics.com.au/170-tie-point-mini-black-solderless-breadboard.html