Vayakhel 5779

The Midrash brings that Moshe was concerned that once he passed away he wouldn't be remembered. Hashem reassured him that his "head would be lifted" when Bnei Yisrael read כי תשא את ראש בני ישראל. Why is this the mitzvah chosen to reassure Moshe? What is the significance of the wording "lifting the head of Bnei Yisrael" in the context of the half shekel?

Why does Rashi see fit to tell us that the instructions to build the Mishkan were given the day after Yom Kippur, he doesn't usually provide a timeline?

The oil brought by the Nesiim was fit for use for lighting and anointing.