We don’t provide links to resources like sketches and schematics within the lecture pages because that increases the risk of errors. We prefer to keep all course resources centralised on Github.
Just go to Github, search by lecture ID, and you will find everything that is available for that lecture.
For example, for lectures 0490[a, b, c] these resources are available:
Please review this lecture on ASBS Getting Serious for more details and example of how this system works.