Hi Sam,
After some messing around, and a few snapshot restores, I ended up getting it working.
Funnily enough, all I needed to do was copy the airtouch4 folder into the custom_components folder and it showed up as an integration. All functional now and thank you for the help 
(files from here: https://github.com/LonePurpleWolf/core/tree/airtouch4-integration-2/homeassistant/components/airtouch4)