Done:
https://github.com/T3P3/Duet/blob/master/DuetWifiv1.0/DuetWifi_Schematic.pdf
For KiCAD you need to use at least version 4.0.2. The custom parts are in the distribution on Github, you might need to point your libraries path at that, I thought it was relative within the project but maybe its not.
edit: added a page to the wiki that links to the source files:
https://duet3d.com/wiki/Source_Files