[sagargv]

They are in the repo:

Schematic - https://github.com/s-gv/cookoo/blob/master/schematic/whistle...

PCB - https://github.com/s-gv/cookoo/tree/master/pcb/gerber

[fordh]

These aren't really the source files, because they aren't easily editable. I believe the parent was asking for the KiCad files.

[sagargv]

KiCAD files:

https://dl.dropboxusercontent.com/u/53155453/cookoo_kicad.zi...

Not sure if this is the latest version.