Yoma 28: Avraham's Yeshiva Days

Why the non-kohen subject to death for setting up the logs. Is this activity its own separate act? Plus, this smacks of the Second Temple. And - the new chapter, with the mishnah beginning to account for the activities of the day of Yom Kippur, which are the activities that apply to every day, as it happens. Checking for daybreak. Bringing the kohen gadol to cleanse himself. Plus, connecting the Torah to the biblical Avraham - why doing so is legitimate and also important. Even to the presentation of Avraham learning in yeshiva (and many others too), though it seems anachronistic.