When I was implementing SimpleDB in 2019, I believe CMU's course didn't have resources and lab assignments that were publicly available. Now CMU has published a full video lecture series (which MIT doesn't have) and their labs. So if I were starting again today, I would probably go with CMU's course.
CMU Intro to Databases Labs: https://15445.courses.cs.cmu.edu/fall2021/assignments.html
CMU Intro to Databases Lectures: https://www.youtube.com/playlist?list=PLSE8ODhjZXjZaHA6QcxDf...
BusTub - CMU's Version of SimpleDB: https://github.com/cmu-db/bustub