This is part 4 of the Pi On The Wall build log, concerning modifications to the enclosure and how everything comes together into its final form factor. Part 3 was about power consumption, and optimizing it for low-power and ultimately low-temperature running. Previous parts can be found at Part 2 and Part 1. The choice to use a standard (for the UK, anyway) footprint for the Pi On The Wall was made very early on. Ease of mounting to the wall (compatibility with existing wall-fixtures) and a w...