1)
What are "Eilav" and "Elemav"?
1.
Malbim: They are, respectively, the Eilim at the openings of the cells, and Ulam ha'Sha'ar, like above (10).
2)
What is "Sha'ar ha'Rishon"?
1.
Radak: It was the [Malbim (3) ? eastern] gate of Har ha'Bayis, which was 50 Amos long and 25 wide.
3)
What is "Chamishim Amah Arko"?
1.
Rashi: It is its height.
2.
Refer to 40:15:3:1. (Surely, the Vilna Gaon's Perush there applies also to here. ? PF)
3.
Malbim: This includes the width of the gate (10) wide, and all the cells on one side (40. Refer to 40:15:6:2 and the notes there.)
4)
What was 25 wide?